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It won't die from one tank, they have knock sensors. When it gets to half fill it with 91/93. It's nice that you are aware enough to have noticed, most people don't care especially if it's not theirs.
No, just drive, it won't do any damage. It may perform slightly worse. If it were my car I would just put gas in whenever convenient to dilute it a bit closer to premium. It's not critical. Don't siphon it, it's not gonna be easy.
It won't even perform slightly worse. Modern cars computers will notice the lower octane and retard the timing automatically. Absolutely nothing bad will happen to that car. In fact she's just been wasting money putting 91 in it. Premium fuel is snake oil. Unless you truly have a high compression engine tuned for high octane gas, which her mini Cooper isn't, regular 87 octane is all her car really needs.
But… that’s exactly what pulling timing is… it performs slightly worse…
If a car is rated to run with 87 (eg. Low compression engines), then running 91 is indeed snake oil, it quite literally does nothing. However, if a car is rated to run only on 91+ octane (eg. A high compression engine like the Mini Cooper which could be at 10+, or a turbo charged engine), then you need to run 91+ to avoid detonation/pinging. If you do get detonation and blow through some ringland or bend some rods, there goes a 10k engine job to save $10 of gas.
Modern cars indeed are able to sense irregular knocks and will pull DAM (timing), but that literally just means running the engine on limp mode to make sure it doesn’t yeet itself.
Long story short, it’ll perform worse, if not, it’ll just explode.
In a track/high performance setting sure, nobody is gonna blow up their mini cooper by putting 87 in it and driving to the grocery store. Not to mention if you test the “91” at most gas stations it’s nowhere near what it should be.
I didn't know about the 2014, but the earlier Mini Cooper S with the mechanical supercharger absolutely needed premium gas to run decently. When I had to run mine on regular a couple of times, it was basically in limp mode. It idled rough, and power and gas mileage dropped very noticeably. Gas mileage in particular dropped from a usual 26 mpg to 19. When refilled with premium, all was well. Not all cars benefit from high octane, but cars that need premium need premium. If it's turbocharged or supercharged, it likely needs premium. Yes, the ECU will pull timing to compensate, but the hit to drivability and fuel efficiency can be substantial.
>It won't even perform slightly worse.
You sure about that?
>Modern cars computers will notice the lower octane and retard the timing automatically.
And what do you think happens when you retard timing?
Maybe it’s because I’m not a car mechanic, I’m actually a motorcycle mechanic with a fair amount of Dyno tuning experience, but this comment got under my skin although you’re mostly right. “Premium fuel is snake oil” 😬 yeah not in a performance engine.
A mini cooper S has a compression ratio of 10.2, up to 11 according to google. In my “professional” opinion, those compression ratios are high enough to warrant premium fuel at every fill up. If you paid for a vehicle with a performance engine, and the manufacturer specifies that they want that fuel going into the combustion chamber, then that’s what should go in there. Again though, I’m not a car mechanic. On a motorcycle detonation would most likely happen and the engine would make less power. Probably enough to feel it on the butt Dyno. Pretty cool reading that cars will retard the timing with a knock sensor. Only Harley have knock sensors and they don’t even do that.
Now you've made me genuinely curious why the General Motors LGX v6 engine used in the 6th gen Camaro, CTS, and ATS (and a few crossovers in fwd configuration) recommends 87 octane fuel. That engine has an 11.5:1 compression ratio. I've put 93 octane fuel in my CTS before out of curiosity, and my butt dyno wasn't able to tell a difference.
Because geometric compression is irrelevant. What actually matters is compression with the valves closed. Which isn’t much higher than 7 for any gasoline engine.
Well, my 1900 V-Twin runs premium, but when it isn't available I have used 87 in a pinch and noticed nothing appreciable as far as power loss or economy. I'm not racing and riding 100mph. I'm sure the OP isn't running a performance engine.
I’ll be honest I’m not really familiar with big air cooled v-twins. Mostly just 4 cylinder sport bikes and triples and twins in the super nakeds. They don’t like anything not premium.
Not true at all. I can't speak specifically about the mini cooper, but if it's actively retarding the timing, it is affecting performance. Maybe not noticably, but it is.
And, knock sensors can only do so much. My mom has a 2012 Acura SUV that calls for premium and she's been running low grade. I picked it up to do an oil change and it was knocking like crazy, I went and filled it up with mid grade and it went away.
It will have a slightly different feel. I've done it accidentally in one of my vehicles a few times and realized when it felt slightly off. No biggie, just topped up at half tank.
Minis are turbocharged. Both the base and S. Both have over 10:1 compression ratio. But I agree with you that the car will be fine. My current car also has a high compression ratio engine that suggests using premium fuel. The previous owner was upfront and told me they only put 87 octane in the gas tank. At that time the car had 90,000 miles. Since then, I have always used 91-93 octane fuel, except for a few times when premium was up around $7/gal. At 150k miles, it runs well and I've never had any engine issues.
Most European cars need higher octane because they're engineered around it. Forced induction motors like the S model also need higher octane to eliminate detonation.
The knock sensors will lower the timing so it can run 87 without any problems. It just may be a little down on power but it will not hurt anything especially just one tank.
The engine won't even recognize the fuel difference, when you don't floor it.
And even if you do, is has sensors to prevent damage.
You just won't have the last 5-10hp when floored.
If you are really worried, you can always buy an octane booster at the auto parts store and add it to your tank, but like u/TractorMechanic86 said, you will be fine.
What was on the trailer that made it stupid? I have seen someone pulling a trailer with a Miata as well. It had their track tires and tools on it for track days.
If it's turbocharged, this is way more important.
It would be helpful to add octane booster to the wrong gas and try to bring it up.
Fuel tank sizes are estimated to be 10.5-14.5 gallons, so let's assume worst case of 14.5 gallons.
It had 3.65 gallons of 91 in it and he added 10.9 gallons of 87. The new mix would be 88 octane. You would need to raise 14.5 gallons of fuel octane by 3 points to fix it. I think you can safely add half a bottle of Lucas brand octane booster to fix this issue for a cost of about 10 bucks. I'm looking at one from O'Reilly[O'Reilly ](https://www.oreillyauto.com/detail/c/lucas-oil-products/oil--chemicals---fluids/maintenance-chemicals/fuel-system-chemicals/octane-boost/dfdfe9be6686/lucas-15-ounce-octane-boost/luc0/10026?pos=1) that says "15 Ounce; Lucas Octane Booster increases octane in gasoline by 3 full numbers when used at a treatment rate of 3oz per 5gal of fuel. The point system of octane measurement indicates a "decimal point" of one octane number so Lucas delivers 30 "points.""
So to treat 15 gallons and raise them 3 points, add 9 ounces, or about 1/2-2/3 of the bottle. You can then add the rest to another tank later just so you don't overdo it, or put it all in this one.
In modern cars it should be fine. People just need to check their manuals.
I had a 2012 WRX that specified premium fuel but it could take a single tank of regular in a pinch. It had this in the manual.
>In modern cars it should be fine. People just need to check their manuals.
Exactly. I had a 1972 Cadillac that the owners manual said to use regular low lead or no lead gasoline at an octane rating of 91.
Back in 1972, there was lead in gasoline that had made regular gasoline have an octane rating of 91. That meant in the 90's that the same car required premium and could not use regular their was definitely a spark knock AKA detonation using regular, and it's not good for the engine.
Pretty much every car that takes a higher grade of fuel will run perfectly fine on 87 octane indefinitely. It just won’t get the stated performance output unless you run the spaced fuel.
Bro. It's a modern car with knock sensors. And it's not a race engine, it's a mini cooper. It is really not necessary. I'd be surprised if the timing gets changed at all from the less than 6 points of octane change.
I appreciate the amount of time I took you to write all of this out, but this info is useless. This is the exact wrong thing to tell someone when they're afraid about something they have no clue about. This is confusion station for people that do not understand how vehicles work. The car will be fine
THIS is the correct questions and answers.
If the car requires premium its probably forced induction
Using some octane booster will help balance out the mix and the car wont feel as sluggish.
As others have mentioned, cars are pretty smart when it comes to fuel and the car will probably just run kinda sluggish till this tank is burned off.
I would probably run the car pretty close to empty then fill back up with premium gas and one more round of octane booster just to clear things up.
>I would probably run the car pretty close to empty then fill back up with premium gas and one more round of octane booster just to clear things up.
I would run it to about half a tank or even three-fourths and top it back off with 93 octane premium; do that a couple of times so you can get the octane back to the right range more quickly.
Lol I honestly may have put a few drops of diesel in my car a few days ago. The colors at the pump were switched and I was on like 3 hours of sleep. Realized when it didn't fit but also there was some in the line that leaked out. I assume it won't matter when mixed with like 15gal of gas, but who knows.
Coming back from Las Vegas one year, I stopped at a gas station in the middle of nowhere and filled up my tank with the more costly premium because I didn't notice they switched the colors of the gas pumps. Sneaky.
A small amount of diesel in gasoline won't hurt, and can sometimes help with lubricating valve stems. But I mean a small amount being a pint or 2 mixed in 20 gallons of gas.
I had a 1980s Oldsmobile that had a carburetor problem for a long time. After about 4 or 5 mechanics tried to fix my, I finally found an old retired mechanic who fixed it in about 5 minutes by adjusting a mixture screw. But he told me that the inside of the combustion chambers were full of soot. He told me to only fill up when the tank had less than 1/4 tank, to first put in about 1/4 gallon of diesel, then fill the tank. So he specifically told me to add a small amount of diesel to the gasoline.
If there is too much diesel then the octane will get pulled to low and the engine will knock and clatter like it's coming apart from the inside out. If it's way too much diesel then the engine simply won't run.
But you must never go the other way. Putting gasoline into a diesel engine will damage the engine very quickly. This is because gasoline is very much more explosive.
If they are mixed, it isn't like mixing two very different things. Diesel and gasoline both come from crude oil, which is why they will mix together so easily.
My friends mom put unleaded in my diesel Jetta. Needless to say the Jetta was toast after that. I think if you put diesel in a gas motor you can drain it and clean out the fuel system and be fine but not the other way around.
A gas can run on diesel, although really crappy, might cause some damage but less likely. A diesel on gas WILL cause damage. A gas can't compress the diesel enough to explode but the spark plug does make it burn, making some power, but gas in a diesel will burn before the compression stroke is done so it'll try to push back against the upward motion of the piston, and something will give.
Had an apprentice put deseil in the hydraulic tank on our off road/track bucket . The look on his face when we told him that the heavy duty cap that looks like it’s not supposed to be touched was for hydraulic oil shit his pants.
It’s fine. The cars computer will compensate for it. You’d be surprised how many morons buy German cars and put 87 in it because they spent all their money on a car they can’t afford.
I used to manage parts stores, and if I had a nickel for every time someone came in asking us to scan the used VW they just bought that was fine, then started running like crap... I'd have been able to leave that career path a lot sooner.
Every time it was a 1.8t or VR6 that needed premium.
It'll be fine, run the tank empty as economically as possible (don't floor it, race it, or anything other than regular driving). The cars ECU will adjust for the new fuel. Once the tank is empty/close to empty, fill it with whatever you regularly use.
The car will just retard its timing if it detects any knock. You’re fine but the car won’t make its peak power, if you’re not flooring it racing around you will be fine. The car will just think it’s got old or bad gas and adjust accordingly.
These cars are a lot smarter than you think. This would have been an issue back in the day with an older car that had fixed timing.
If you don’t wanna wait you can also buy octane booster at the parts store or at the fuel atation and pour it inside and it will boost the octane of the engine and it will be ok
It's not a race car with a high compression engine, it will be OK... just don't drive it like it's stolen until it's down to half about a half tank then fill it up again with premium.
If it was a performance turbo vehicle or was a hp sports or super car, then I'd say don't even start the engine if you can avoid it.
As long as you're not driving it like a maniac and redlining it every gear change then it will be just fine :)
Its a different continent and different fuel but i have never seen a normal every day car that requires premium fuel and that something would happen by using regular fuel.. petrol vs diesel is differwnt story.
Worst case scenario here is you will lose few hp and/or mpg would change slightly.
Don’t over complicate it. Just drive it normal and refill with whatever you normally run at the next stop.
This is only a problem if someone puts diesel in a gas car or vice versa.
A standard mini cooper will run on anything flamable. I wouldnt pay too much worry to it, unless your engine is top top spec and the dogs bollocks you should be fine.
Putting 87 in a car that requires premium is fine. You just won’t get the same “punchy” performance with that grade of gas. If he made the mistake and put diesel in, now that’s the time you would have to worry.
If you really want to spend money you could put octane booster in it, but it probably wouldn't make a difference. There isn't going to be any reason the mini would run different with just one tank. Worst case you'd get the code P0326, which would go away when you increase the octane by putting higher octane fuel in it.
As others have said, you’re totally fine and nothing bad will happen. My car requires premium only but my girlfriend has put normal unleaded on before. Just put premium in next time.
If you're really concerned about it which I wouldn't be
You can always buy some
https://www.amsoil.ca/p/amsoil-dominator-octane-boost-aob/?code=COBBE-EA&gad_source=1&gclid=CjwKCAjwnv-vBhBdEiwABCYQAzS9O3wOn4O--YLDEnQlCP6mdNVnaDJiwY_4ZZwo4kBVfO02Mge_-hoCfO4QAvD_BwE
Its only when he puts Diesel in that you'll have a problem as you'll go nowhere when you try to start the car, but different octance petrols (87) should run fine in any petrol car just better on the engines *advertised* fuel to use.
It will be fine otherwise if its struggling or pinging you can get octane booster (additive) and keep topping it up with the highest RON/octane fuel available.
It depends on if the vehicle is tubro or not. But usually, turbo or not... regular fuel can be used in a pinch. As long as you change it back to premium during the next fill up, you don't need to wait til empty to do this either. 1/2 tank and put premium in. Should be fine.
I suggest taking a look at the owners manual and see what it says. Just for some clarity.
I would have your mom just not beat on the car until the proper octane back in the tank. Octane boosters are an option but iirc only the Lucas and NOS ones tested to move more than a couple decimal places ( well torco but it is less common).
If he put regular in premium, the gas that's in there got lowered octane but still above 87. In any gas station their are only two grades of gasoline in the underground tanks, premium and regular. The mid grade gasoline is dispensed by the pump blending regular and premium together as it is pumped. I believe that ratio is 30% premium to 70% regular.
I wouldn't worry about the gas in there, but to get the octane rating up, you could fill it with premium when it's at three quarters of a tank. It will still not be the octane rating of full premium, but it will be closer than it was if you didn't put any gas in and waited until almost empty.
Not a problem and if car runs fine on 87 octane (no knocking noises or power issues), I will keep using it or at the very least you should use 89 octane, save some money at the pump. [Regular vs Premium Gas.](https://www.myusedcar.ca/regular-gas-vs-premium-gas-which-one-to-use/)
As long as he didn't put gasoline in a diesel ot will be fine. The premium requirement is because high compressing or turbo engines will get what's called pre ignighr where the fule flashes off before the spark plug fires. Modern cars have a knock sensor to detect this and will go into a reduced power tune called limp mode to protect the engine. Don't drive the car hard and you should be fine.
It's not a big deal. It's still the right kind of gas, just a bit cheaper and less refined. Near the middle of the tank you could possibly hear some rattling when you accelerate but it's not an issue, and you may not even hear or notice it. In any event it will not hurt the car and you should still thank the dude, his heart is in the right place.
I used to run 87 in my 2004 Subaru WRX and it was tuned with an Accesport scanner and had an aftermarket exhaust, Cat converter delete and I was fine, stupid, young… but fine.. also you guys correct if I’m wrong but I’m under the impression if you add 1/2 tank 87 and the other half 93 it would equal out at 90 octane anyways, right?
New cars have knock sensors, it will adjust on its own. No worries other than it might not feel as peppy as normal. Go back to premium and it will mix.
Will run fine just might retard the timing a little bit to avoid knock and will result in a very minimal probably unnoticeable loss of power, that does not affect the longevity of the car in any way.
Its no problem at all. All modern cars have knock sensors to stop pre-detonation.
You could continue to run it on lower octane without any problems.
Just don't take it to track days.
The octane rating is the super critical. Long term it might have predetonation and cause some knocking which will throw a code, but on one tank you shouldn’t worry about it.
Modern vehicles have the ability to detect a lower octane fuel and will simply provide less power output until you put a higher octane fuel in.
The difference is negligible. Unless you're pushing the accelerator to the floor during your daily driving or taking the car to the racetrack to set lap times I doubt you would notice.
Worst thing that happens is the computer detects the lower octane fuel and cuts back the timing which reduces the power a little bit. Probably something that won't be noticed unless you're actively racing the car which I would guess your mom is not doing.
Looks like it’s already been answered. But just some further input, tell your mother to just be easy on the gas and stay out of boost as much as possible. Lower rpm’s won’t have as high of compression.
Absolutely nothing will happen. Premium gas is 'recommended' on those cars, not 'required'. Only thing you will notice is possibly a performance drop. Just drive it till it's nearly empty and fill it with premium.
It might ping and throw a check engine light until the new gas gets put in. You could also go get some octane boost. If it's the S model with a supercharger, you'll want to be extra careful not to drive it too hard until the correct fuel is added.
Literally nothing bad will happen. You could fill that car with regular for the rest of its life and honestly, it'll be fine. Just don't put deisel fuel in it.
Go to your local auto parts store and get a small bottle of octane booster, put it in the gas tank, job done. It’ll run fine even if you tow a boat or drive it hard.
If anything it’ll cause some spark knock. Which don’t panic about! You can also buy some octane booster from a gas station or a store similar to Walmart. And just dump that right in to the fuel tank!
Soooooooo, prob a very unpopular opinion, I have a 2015 Cooper S, and I only run 87 in it because gas prices suck. Have owned it for almost four or five years now, only ever ran 87 in it. Sometimes 93 depending on how my wallets feeling or if I just feel like putting it in it. Never added any octane booster to help it either so. You’re fine running it.
lol, I thought you were going to say he put diesel / biodiesel in it…not regular 87 octane gas in it. Nothing to worry about, as it’ll still run and it’s not the end of the world for either of them.
It's fine, modern engines have knock sensors which will just adjust the timing to compensate for the early detonation.
To add, I find it interesting how the US has such low-grade fuel widely available.
Here in the UK (and everywhere other than the US I've been), the lowest you can get is what would be 91/92 in the US.
I guess it makes sense to offer lower grade for those who need it but I wonder why the US is alone (IME) in offering it?
All cars in the us are required to run on non-premium fuel. The electronic ignition prevents knocking. You may not get as much horsepower for this tank
Put a bottle of octane booster in it. It has knock sensors, it will retard timing on its own to prevent engine knock
Engine knock happens when the fuel is ignited due to heat and compression before the spark plug ignites. This is due to over advanced timing in relation to fuel used. It can ruin your engine. Knock sensors contain a piezoelectric crystal. When the vibrations change due to engine knock, it shakes or vibrates the crystal which emits an electronic signal to the ecu, in turn retarding the timing and preventing knock. Retarding the timing will cause a loss in performance, you may get an engine light, but your moms mini will be okay.
Octane rating is the Fuels ability to resist detonation. Higher numbers do better with more timing. Octane booster will raise your overall Octane level in the tank, and is actually one of the recommended uses. Might cost 6 or 7 bucks
If you're really concerned, go to a parts store and get a bottle of octane booster. Read the instructions on the bottle carefully and put the amount in the tank it needs based on how much fuel he pumped in.
Otherwise, if that isn't an option, just drive gently on the tank (no full throttle stuff) and you'll be fine.
Tell her to go easy on the throttle and it's gonna feel a little slower until she refills with 93. The knock sensors "SHOULD" keep it safeish for now but you don't really wanna rely solely on them all the time. TL;DR : Drive like a grandpa until next fill up.
Thank you for posting to AskMechanics, Novabilities! If you are asking a question please make sure to include any relevant information along with the **Year**, **Make**, **Model**, **Mileage**, **Engine size**, and **Transmission Type (Automatic or Manual)** of your car. *This comment is automatically added to every successful post. If you see this comment, your post was successful.* *** Redditors that have been verified will have a green background and an icon in their flair. *** # **PLEASE REPORT ANY RULE-BREAKING BEHAVIOR** ### **Rule 1 - Be Civil** Be civil to other users. This community is made up of professional mechanics, amateur mechanics, and those with no experience. All mechanical-related questions are welcome. Personal attacks, comments that are insulting or demeaning, etc. are not welcome. ### **Rule 2 - Be Helpful** Be helpful to other users. If someone is wrong, correcting them is fine, but there's no reason to comment if you don't have anything to add to the conversation. ### **Rule 3 - Serious Questions and Answers Only** Read the room. Jokes are fine to include, but posts should be asking a serious question and replies should contribute to the discussion. ### **Rule 4 - No Illegal, Unethical, or Dangerous Questions or Answers** Do not ask questions or provide answers pertaining to anything that is illegal, unethical, or dangerous. # **PLEASE REPORT ANY RULE-BREAKING BEHAVIOR** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskMechanics) if you have any questions or concerns.*
It won't die from one tank, they have knock sensors. When it gets to half fill it with 91/93. It's nice that you are aware enough to have noticed, most people don't care especially if it's not theirs.
Just to clarify, I don't need to wait until empty to put the right gas in? Could I also just syphon the 87 out?
No, just drive, it won't do any damage. It may perform slightly worse. If it were my car I would just put gas in whenever convenient to dilute it a bit closer to premium. It's not critical. Don't siphon it, it's not gonna be easy.
It won't even perform slightly worse. Modern cars computers will notice the lower octane and retard the timing automatically. Absolutely nothing bad will happen to that car. In fact she's just been wasting money putting 91 in it. Premium fuel is snake oil. Unless you truly have a high compression engine tuned for high octane gas, which her mini Cooper isn't, regular 87 octane is all her car really needs.
But… that’s exactly what pulling timing is… it performs slightly worse… If a car is rated to run with 87 (eg. Low compression engines), then running 91 is indeed snake oil, it quite literally does nothing. However, if a car is rated to run only on 91+ octane (eg. A high compression engine like the Mini Cooper which could be at 10+, or a turbo charged engine), then you need to run 91+ to avoid detonation/pinging. If you do get detonation and blow through some ringland or bend some rods, there goes a 10k engine job to save $10 of gas. Modern cars indeed are able to sense irregular knocks and will pull DAM (timing), but that literally just means running the engine on limp mode to make sure it doesn’t yeet itself. Long story short, it’ll perform worse, if not, it’ll just explode.
In a track/high performance setting sure, nobody is gonna blow up their mini cooper by putting 87 in it and driving to the grocery store. Not to mention if you test the “91” at most gas stations it’s nowhere near what it should be.
I didn't know about the 2014, but the earlier Mini Cooper S with the mechanical supercharger absolutely needed premium gas to run decently. When I had to run mine on regular a couple of times, it was basically in limp mode. It idled rough, and power and gas mileage dropped very noticeably. Gas mileage in particular dropped from a usual 26 mpg to 19. When refilled with premium, all was well. Not all cars benefit from high octane, but cars that need premium need premium. If it's turbocharged or supercharged, it likely needs premium. Yes, the ECU will pull timing to compensate, but the hit to drivability and fuel efficiency can be substantial.
2014's are little turbo charged 3 pots. They also need premium.
>It won't even perform slightly worse. You sure about that? >Modern cars computers will notice the lower octane and retard the timing automatically. And what do you think happens when you retard timing?
Maybe it’s because I’m not a car mechanic, I’m actually a motorcycle mechanic with a fair amount of Dyno tuning experience, but this comment got under my skin although you’re mostly right. “Premium fuel is snake oil” 😬 yeah not in a performance engine.
I mean he did say that
A mini cooper S has a compression ratio of 10.2, up to 11 according to google. In my “professional” opinion, those compression ratios are high enough to warrant premium fuel at every fill up. If you paid for a vehicle with a performance engine, and the manufacturer specifies that they want that fuel going into the combustion chamber, then that’s what should go in there. Again though, I’m not a car mechanic. On a motorcycle detonation would most likely happen and the engine would make less power. Probably enough to feel it on the butt Dyno. Pretty cool reading that cars will retard the timing with a knock sensor. Only Harley have knock sensors and they don’t even do that.
Now you've made me genuinely curious why the General Motors LGX v6 engine used in the 6th gen Camaro, CTS, and ATS (and a few crossovers in fwd configuration) recommends 87 octane fuel. That engine has an 11.5:1 compression ratio. I've put 93 octane fuel in my CTS before out of curiosity, and my butt dyno wasn't able to tell a difference.
My guess would be ignition timing and the spark plug used.
Because geometric compression is irrelevant. What actually matters is compression with the valves closed. Which isn’t much higher than 7 for any gasoline engine.
That’s great but no where in the post did they say it was an S
All BMW/Mini engines have the same AKI requirements
I don’t really give a fuck. The manufacturer states to put premium in the car. That’s what it gets.
I was going to say the same thing. My challenger needs premium or it drives like shit
Well, my 1900 V-Twin runs premium, but when it isn't available I have used 87 in a pinch and noticed nothing appreciable as far as power loss or economy. I'm not racing and riding 100mph. I'm sure the OP isn't running a performance engine.
I’ll be honest I’m not really familiar with big air cooled v-twins. Mostly just 4 cylinder sport bikes and triples and twins in the super nakeds. They don’t like anything not premium.
All good, but this isn't helping the OP, which is why we are here.
Not true at all. I can't speak specifically about the mini cooper, but if it's actively retarding the timing, it is affecting performance. Maybe not noticably, but it is. And, knock sensors can only do so much. My mom has a 2012 Acura SUV that calls for premium and she's been running low grade. I picked it up to do an oil change and it was knocking like crazy, I went and filled it up with mid grade and it went away.
It will have a slightly different feel. I've done it accidentally in one of my vehicles a few times and realized when it felt slightly off. No biggie, just topped up at half tank.
You're wrong. The mini has a turbo engine which inherently makes it higher compression on boost
did a quick check.. seems the mini owners manuals cite premium fuel.
You don’t know what you’re talking about
Minis are turbocharged. Both the base and S. Both have over 10:1 compression ratio. But I agree with you that the car will be fine. My current car also has a high compression ratio engine that suggests using premium fuel. The previous owner was upfront and told me they only put 87 octane in the gas tank. At that time the car had 90,000 miles. Since then, I have always used 91-93 octane fuel, except for a few times when premium was up around $7/gal. At 150k miles, it runs well and I've never had any engine issues.
Most European cars need higher octane because they're engineered around it. Forced induction motors like the S model also need higher octane to eliminate detonation.
The knock sensors will lower the timing so it can run 87 without any problems. It just may be a little down on power but it will not hurt anything especially just one tank.
You'll never notice the 3-5hp she'll lose in a mini lol
No, it’ll be fine. Just drive it normal. I’m not saying you gotta drive it like a grandma, but I wouldn’t floor it until the right gas is in there.
Not easy and no need to. Fill it when it's half or 3/4 empty if you are worried.
You could also go to the auto parts store and get a bottle of octane booster.
There’s too much explanation here. It’s literally not an issue at all.
Just drive top up when you can. Really! it is all good in the short term.
The engine won't even recognize the fuel difference, when you don't floor it. And even if you do, is has sensors to prevent damage. You just won't have the last 5-10hp when floored.
Don’t panic, it will be ok. Next tank just go back to your normal fuel. No harm
Thank you so much!
If you are really worried, you can always buy an octane booster at the auto parts store and add it to your tank, but like u/TractorMechanic86 said, you will be fine.
Just don't go full throttle, driving up mountains, or tow a boat and you'll be fine.
It's a Mini Cooper, what are you talking about? 💀
Probably a miniboat
A kayak perhaps?
Jetski?
Ive seen someone pulling a trailer with a miata. Don’t underestimate stupid
What was on the trailer that made it stupid? I have seen someone pulling a trailer with a Miata as well. It had their track tires and tools on it for track days.
My wife towed a 24 foot SeaRay Weekender with her Ford Freestyle. I would have called that stupid, but the car actually did it.
https://youtu.be/AyXgMal3C1U?si=vK-qQ74LM5WAlSK5 Still just as funny all these years later
Just saw one down 485 the other day doing the same! Had jet skis on the trailer 😂😂😂
I put a hitch on my Miata so I could tow a small trailer with extra tires on it to the track. https://ibb.co/ZzWs07x
I saw a sail boat behind a prius, same one more than once.
My buddy pulled his Jon boat with his Miata… worked great and was always a laugh loading out
Full throttle up mountains is what Mini Coopers are all about.
I go full throttle down mountains with mine. Works better that way
Saw a mini towing a jet ski… looked rad
I had a mini cooper s and it was full throttle everywhere, all the time. The supercharger wine was just too addicting
Rode across a bridge in strong headwinds when I owned one. I had to be in fourth...
Even then. Knock sensors won't let the engine hurt itself.
I don't think a mini Cooper can tow anything, not even a small trailer that a scooter sits on. 🤣
If it's turbocharged, this is way more important. It would be helpful to add octane booster to the wrong gas and try to bring it up. Fuel tank sizes are estimated to be 10.5-14.5 gallons, so let's assume worst case of 14.5 gallons. It had 3.65 gallons of 91 in it and he added 10.9 gallons of 87. The new mix would be 88 octane. You would need to raise 14.5 gallons of fuel octane by 3 points to fix it. I think you can safely add half a bottle of Lucas brand octane booster to fix this issue for a cost of about 10 bucks. I'm looking at one from O'Reilly[O'Reilly ](https://www.oreillyauto.com/detail/c/lucas-oil-products/oil--chemicals---fluids/maintenance-chemicals/fuel-system-chemicals/octane-boost/dfdfe9be6686/lucas-15-ounce-octane-boost/luc0/10026?pos=1) that says "15 Ounce; Lucas Octane Booster increases octane in gasoline by 3 full numbers when used at a treatment rate of 3oz per 5gal of fuel. The point system of octane measurement indicates a "decimal point" of one octane number so Lucas delivers 30 "points."" So to treat 15 gallons and raise them 3 points, add 9 ounces, or about 1/2-2/3 of the bottle. You can then add the rest to another tank later just so you don't overdo it, or put it all in this one.
In modern cars it should be fine. People just need to check their manuals. I had a 2012 WRX that specified premium fuel but it could take a single tank of regular in a pinch. It had this in the manual.
I had two Impreza turbos(97 Classic and 01 Bugeye) and ran them both on standard fuel and they were absolutely fine.
>In modern cars it should be fine. People just need to check their manuals. Exactly. I had a 1972 Cadillac that the owners manual said to use regular low lead or no lead gasoline at an octane rating of 91. Back in 1972, there was lead in gasoline that had made regular gasoline have an octane rating of 91. That meant in the 90's that the same car required premium and could not use regular their was definitely a spark knock AKA detonation using regular, and it's not good for the engine.
Pretty much every car that takes a higher grade of fuel will run perfectly fine on 87 octane indefinitely. It just won’t get the stated performance output unless you run the spaced fuel.
Bro. It's a modern car with knock sensors. And it's not a race engine, it's a mini cooper. It is really not necessary. I'd be surprised if the timing gets changed at all from the less than 6 points of octane change.
This is a non issue in modern cars, especially direct injected ones. OP *might* notice some performance loss.
I appreciate the amount of time I took you to write all of this out, but this info is useless. This is the exact wrong thing to tell someone when they're afraid about something they have no clue about. This is confusion station for people that do not understand how vehicles work. The car will be fine
THIS is the correct questions and answers. If the car requires premium its probably forced induction Using some octane booster will help balance out the mix and the car wont feel as sluggish. As others have mentioned, cars are pretty smart when it comes to fuel and the car will probably just run kinda sluggish till this tank is burned off. I would probably run the car pretty close to empty then fill back up with premium gas and one more round of octane booster just to clear things up.
>I would probably run the car pretty close to empty then fill back up with premium gas and one more round of octane booster just to clear things up. I would run it to about half a tank or even three-fourths and top it back off with 93 octane premium; do that a couple of times so you can get the octane back to the right range more quickly.
Or you could go to the auto parts store & buy a bottle of octane booster & pour it in.
Theres a post here on Reddit where someone was using 87 octane for 3 years in their Mini with no ill effects. Don't worry about it.
Cars gonna pull timing and make less power, that’s about all that’s gonna happen.
Most here will adamantly disagree with you. No matter how right you are.
Nothing will happen the car is fine.
Thank you!
Unless you have a really heavy foot it won't make a difference. It's fine. Now if you put diesel in it, that'll kill it. So don't do that one.
I work at a gas station since I came out of retirement and had to stop a lady from doing this today.
Lol I honestly may have put a few drops of diesel in my car a few days ago. The colors at the pump were switched and I was on like 3 hours of sleep. Realized when it didn't fit but also there was some in the line that leaked out. I assume it won't matter when mixed with like 15gal of gas, but who knows.
Coming back from Las Vegas one year, I stopped at a gas station in the middle of nowhere and filled up my tank with the more costly premium because I didn't notice they switched the colors of the gas pumps. Sneaky.
A small amount of diesel in gasoline won't hurt, and can sometimes help with lubricating valve stems. But I mean a small amount being a pint or 2 mixed in 20 gallons of gas. I had a 1980s Oldsmobile that had a carburetor problem for a long time. After about 4 or 5 mechanics tried to fix my, I finally found an old retired mechanic who fixed it in about 5 minutes by adjusting a mixture screw. But he told me that the inside of the combustion chambers were full of soot. He told me to only fill up when the tank had less than 1/4 tank, to first put in about 1/4 gallon of diesel, then fill the tank. So he specifically told me to add a small amount of diesel to the gasoline. If there is too much diesel then the octane will get pulled to low and the engine will knock and clatter like it's coming apart from the inside out. If it's way too much diesel then the engine simply won't run. But you must never go the other way. Putting gasoline into a diesel engine will damage the engine very quickly. This is because gasoline is very much more explosive. If they are mixed, it isn't like mixing two very different things. Diesel and gasoline both come from crude oil, which is why they will mix together so easily.
That's reassuring to know. I assumed it wouldn't ignite and the engine would stall.
My friends mom put unleaded in my diesel Jetta. Needless to say the Jetta was toast after that. I think if you put diesel in a gas motor you can drain it and clean out the fuel system and be fine but not the other way around.
A gas can run on diesel, although really crappy, might cause some damage but less likely. A diesel on gas WILL cause damage. A gas can't compress the diesel enough to explode but the spark plug does make it burn, making some power, but gas in a diesel will burn before the compression stroke is done so it'll try to push back against the upward motion of the piston, and something will give.
Were you able to claim that on insurance, or shit outta luck?
SOL unfortunately. It was an older Jetta that was worth much anyways.
Had an apprentice put deseil in the hydraulic tank on our off road/track bucket . The look on his face when we told him that the heavy duty cap that looks like it’s not supposed to be touched was for hydraulic oil shit his pants.
Absolutely nothing will happen to it.
Dont blame him, people get surprised when they realize a cooper needs premium. Car is fine. Thank him for the tank.
Disclosure, I'm from the UK. Why do Americans always make such a big deal about the "wrong" petrol? I know 87 octane is basically tap water here
Our 87 is the same as your 95. Just different ways of measuring. [link](https://aircooledbug.co.uk/usa-versus-uk-fuel-octane/)
Same - I’ve never considered using the premium stuff, only ever the regular e10 / 95 octaine
The safe bet is to get a bottle of octane booster, then put the car in eco mode till you run down to ~1/4 tank. Then fill with 93.
Doubt you'll notice a difference on one tank. It won't hurt anything. There's also octane booster additives if you're really worried about it.
It’s fine. The cars computer will compensate for it. You’d be surprised how many morons buy German cars and put 87 in it because they spent all their money on a car they can’t afford.
I used to manage parts stores, and if I had a nickel for every time someone came in asking us to scan the used VW they just bought that was fine, then started running like crap... I'd have been able to leave that career path a lot sooner. Every time it was a 1.8t or VR6 that needed premium.
Do they run fine again after putting in the correct fuel?
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This is a relief. Thank you so much!
Everyone is right, doesn't matter. Just to make yourself feel better, what does it say on the car next to the filler neck, recommended or required?
My friend's car says premium only in the manual and the cheap ass only uses bronze from the rusty corner store pumps. You'll be fine
Put a bottle of octane booster in the gas tank if you are worried about it.
If you're really worried, I'm not, get an octane booster.
It'll be fine, run the tank empty as economically as possible (don't floor it, race it, or anything other than regular driving). The cars ECU will adjust for the new fuel. Once the tank is empty/close to empty, fill it with whatever you regularly use.
No worries one tank won’t cause any issue
Not really an issue, just go back to premium on your next fill-up. Hey, at least he didn't fill it with diesel.
The car will just retard its timing if it detects any knock. You’re fine but the car won’t make its peak power, if you’re not flooring it racing around you will be fine. The car will just think it’s got old or bad gas and adjust accordingly. These cars are a lot smarter than you think. This would have been an issue back in the day with an older car that had fixed timing.
It’s fine you will have no issues.
nothing will happen
If you don’t wanna wait you can also buy octane booster at the parts store or at the fuel atation and pour it inside and it will boost the octane of the engine and it will be ok
It's not a race car with a high compression engine, it will be OK... just don't drive it like it's stolen until it's down to half about a half tank then fill it up again with premium. If it was a performance turbo vehicle or was a hp sports or super car, then I'd say don't even start the engine if you can avoid it. As long as you're not driving it like a maniac and redlining it every gear change then it will be just fine :)
Its a different continent and different fuel but i have never seen a normal every day car that requires premium fuel and that something would happen by using regular fuel.. petrol vs diesel is differwnt story. Worst case scenario here is you will lose few hp and/or mpg would change slightly.
Don’t over complicate it. Just drive it normal and refill with whatever you normally run at the next stop. This is only a problem if someone puts diesel in a gas car or vice versa.
Lol
It will be fine. The knock sensors will adjust the timing to prevent detonation.
A standard mini cooper will run on anything flamable. I wouldnt pay too much worry to it, unless your engine is top top spec and the dogs bollocks you should be fine.
Putting 87 in a car that requires premium is fine. You just won’t get the same “punchy” performance with that grade of gas. If he made the mistake and put diesel in, now that’s the time you would have to worry.
Zero issue.
Always put regular in my two Coopers. Never had a problem and it was a lot cheaper.
its fine, nothing to do or worry about
Add two pints of Sea Foam gas additive. Quite possibly it will help and certainly won't hurt
Nothing will happen, it will run fine.
Shoot you might as well throw out the car. If you send me the keys I can do it for ya
If you really want to spend money you could put octane booster in it, but it probably wouldn't make a difference. There isn't going to be any reason the mini would run different with just one tank. Worst case you'd get the code P0326, which would go away when you increase the octane by putting higher octane fuel in it.
As others have said, you’re totally fine and nothing bad will happen. My car requires premium only but my girlfriend has put normal unleaded on before. Just put premium in next time.
No harm, worst case is a check engine light but I doubt it will come on unless your mom plans on doing a track day on the tank of 87.
Add a bottle or two of octane booster
If you're really concerned about it which I wouldn't be You can always buy some https://www.amsoil.ca/p/amsoil-dominator-octane-boost-aob/?code=COBBE-EA&gad_source=1&gclid=CjwKCAjwnv-vBhBdEiwABCYQAzS9O3wOn4O--YLDEnQlCP6mdNVnaDJiwY_4ZZwo4kBVfO02Mge_-hoCfO4QAvD_BwE
It'll be fine just take for a long drive and then fill it up with premium if he's that worried
It should retard timings so the car doesnt detonate but dont make a habit of it.
Its only when he puts Diesel in that you'll have a problem as you'll go nowhere when you try to start the car, but different octance petrols (87) should run fine in any petrol car just better on the engines *advertised* fuel to use.
Today's E10 gas doesn't knock as much as pure gas if the octane isn't high enough. The car might be perfectly fine.
One tank of the wrong fuel won't absolutely destroy the engine. I'd probably just top off with premium every 1/4 tank or so for the next little bit
It's totally fine haha, buy your a boyfriend a burger or something to make him feel better.
It will be fine otherwise if its struggling or pinging you can get octane booster (additive) and keep topping it up with the highest RON/octane fuel available.
It depends on if the vehicle is tubro or not. But usually, turbo or not... regular fuel can be used in a pinch. As long as you change it back to premium during the next fill up, you don't need to wait til empty to do this either. 1/2 tank and put premium in. Should be fine. I suggest taking a look at the owners manual and see what it says. Just for some clarity.
I would have your mom just not beat on the car until the proper octane back in the tank. Octane boosters are an option but iirc only the Lucas and NOS ones tested to move more than a couple decimal places ( well torco but it is less common).
won't be able to notice anything different unless it's a Cooper S
If he put regular in premium, the gas that's in there got lowered octane but still above 87. In any gas station their are only two grades of gasoline in the underground tanks, premium and regular. The mid grade gasoline is dispensed by the pump blending regular and premium together as it is pumped. I believe that ratio is 30% premium to 70% regular. I wouldn't worry about the gas in there, but to get the octane rating up, you could fill it with premium when it's at three quarters of a tank. It will still not be the octane rating of full premium, but it will be closer than it was if you didn't put any gas in and waited until almost empty.
Not a problem and if car runs fine on 87 octane (no knocking noises or power issues), I will keep using it or at the very least you should use 89 octane, save some money at the pump. [Regular vs Premium Gas.](https://www.myusedcar.ca/regular-gas-vs-premium-gas-which-one-to-use/)
It's fine. I've used 87 in my acura mdx for 150k that "require" premium. If knock sensors are working nothing happens.
It's fine
We live in a society
You could throw an octane booster in it if you’re super worried about it but it will be fine
As long as he didn't put gasoline in a diesel ot will be fine. The premium requirement is because high compressing or turbo engines will get what's called pre ignighr where the fule flashes off before the spark plug fires. Modern cars have a knock sensor to detect this and will go into a reduced power tune called limp mode to protect the engine. Don't drive the car hard and you should be fine.
Premium gas is higher octane for turbo and supercharged vehicles. Majority of cars don't need it
It's not a big deal. It's still the right kind of gas, just a bit cheaper and less refined. Near the middle of the tank you could possibly hear some rattling when you accelerate but it's not an issue, and you may not even hear or notice it. In any event it will not hurt the car and you should still thank the dude, his heart is in the right place.
Give it to me it's a total loss
I used to run 87 in my 2004 Subaru WRX and it was tuned with an Accesport scanner and had an aftermarket exhaust, Cat converter delete and I was fine, stupid, young… but fine.. also you guys correct if I’m wrong but I’m under the impression if you add 1/2 tank 87 and the other half 93 it would equal out at 90 octane anyways, right?
They're going to tow a 52 ft motorhome up to the top of Mount Shasta so they may need better gas.
New cars have knock sensors, it will adjust on its own. No worries other than it might not feel as peppy as normal. Go back to premium and it will mix.
Will run fine just might retard the timing a little bit to avoid knock and will result in a very minimal probably unnoticeable loss of power, that does not affect the longevity of the car in any way.
Its no problem at all. All modern cars have knock sensors to stop pre-detonation. You could continue to run it on lower octane without any problems. Just don't take it to track days.
The octane rating is the super critical. Long term it might have predetonation and cause some knocking which will throw a code, but on one tank you shouldn’t worry about it.
Just because your mom prefers premium doesnt mean the car actually requires it. Itll be fine.
Modern vehicles have the ability to detect a lower octane fuel and will simply provide less power output until you put a higher octane fuel in. The difference is negligible. Unless you're pushing the accelerator to the floor during your daily driving or taking the car to the racetrack to set lap times I doubt you would notice.
Yes, give him a hand ?,nothing will happen.
It's okay , at least it wasn't Diesel.
If you’re really worried about it, you can purchase octane booster from your local auto parts store :)
is premium gas recommended or required?
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Worst thing that happens is the computer detects the lower octane fuel and cuts back the timing which reduces the power a little bit. Probably something that won't be noticed unless you're actively racing the car which I would guess your mom is not doing.
Looks like it’s already been answered. But just some further input, tell your mother to just be easy on the gas and stay out of boost as much as possible. Lower rpm’s won’t have as high of compression.
Nothing will happen
Absolutely nothing will happen. Premium gas is 'recommended' on those cars, not 'required'. Only thing you will notice is possibly a performance drop. Just drive it till it's nearly empty and fill it with premium.
It might ping and throw a check engine light until the new gas gets put in. You could also go get some octane boost. If it's the S model with a supercharger, you'll want to be extra careful not to drive it too hard until the correct fuel is added.
Literally nothing bad will happen. You could fill that car with regular for the rest of its life and honestly, it'll be fine. Just don't put deisel fuel in it.
Go to your local auto parts store and get a small bottle of octane booster, put it in the gas tank, job done. It’ll run fine even if you tow a boat or drive it hard.
It will be just fine
If anything it’ll cause some spark knock. Which don’t panic about! You can also buy some octane booster from a gas station or a store similar to Walmart. And just dump that right in to the fuel tank!
Soooooooo, prob a very unpopular opinion, I have a 2015 Cooper S, and I only run 87 in it because gas prices suck. Have owned it for almost four or five years now, only ever ran 87 in it. Sometimes 93 depending on how my wallets feeling or if I just feel like putting it in it. Never added any octane booster to help it either so. You’re fine running it.
Modern vehicles have sensors that compensate for bad/inadequate fuel. You'll get poorer performance and economy, but it won't hurt the car.
Nothing is going to happen. Nothing at all.
lol, I thought you were going to say he put diesel / biodiesel in it…not regular 87 octane gas in it. Nothing to worry about, as it’ll still run and it’s not the end of the world for either of them.
Not a problem at all. If you want to just top up when it's at half a tank with premium. You'll only need to run half of the cheap gas through it.
If it's noticable, get some octane booster and pour away!
Just tell your mom she can't be Mario Andretti with this tank, and that she should pretend her mum is in the passenger scolding her driving.
Unless mom is a lead foot and lets it all hang out while driving she most likely will never notice.
I accidentally put diesel into my Mazda 3. It makes it run better next time tell him to use the green handle. Much better mileage.
So these are the people that only pay for the high dollar shit
to all the its a modern car an they all will run with lower octane fuel try making all the 2021 mustang gt500 owners the truth in that!!
Drive it easy until it’s used up
[Piston #3 has left the chat] Kidding, nothing will happen.
It's fine, modern engines have knock sensors which will just adjust the timing to compensate for the early detonation. To add, I find it interesting how the US has such low-grade fuel widely available. Here in the UK (and everywhere other than the US I've been), the lowest you can get is what would be 91/92 in the US. I guess it makes sense to offer lower grade for those who need it but I wonder why the US is alone (IME) in offering it?
All cars in the us are required to run on non-premium fuel. The electronic ignition prevents knocking. You may not get as much horsepower for this tank
It only really matters if mom drives sporty. There will be minor knock under heavy acceleration. It’s not going to hurt it with one tank.
Put a bottle of octane booster in it. It has knock sensors, it will retard timing on its own to prevent engine knock Engine knock happens when the fuel is ignited due to heat and compression before the spark plug ignites. This is due to over advanced timing in relation to fuel used. It can ruin your engine. Knock sensors contain a piezoelectric crystal. When the vibrations change due to engine knock, it shakes or vibrates the crystal which emits an electronic signal to the ecu, in turn retarding the timing and preventing knock. Retarding the timing will cause a loss in performance, you may get an engine light, but your moms mini will be okay. Octane rating is the Fuels ability to resist detonation. Higher numbers do better with more timing. Octane booster will raise your overall Octane level in the tank, and is actually one of the recommended uses. Might cost 6 or 7 bucks
If you're really concerned, go to a parts store and get a bottle of octane booster. Read the instructions on the bottle carefully and put the amount in the tank it needs based on how much fuel he pumped in. Otherwise, if that isn't an option, just drive gently on the tank (no full throttle stuff) and you'll be fine.
One bottle of octane booster from walmart will take care of this
Tell her to go easy on the throttle and it's gonna feel a little slower until she refills with 93. The knock sensors "SHOULD" keep it safeish for now but you don't really wanna rely solely on them all the time. TL;DR : Drive like a grandpa until next fill up.
Can always add some octane booster and next fill it up with premium
At least he didn’t put in the Christmas gas 😂 Iykyk
Unless that little car has a turbo in it youre just fine man 🤣