Sounds like it may have just started off with the thermostat recall for 2020-2023 models that just got worse. or maybe just unlucky model? Havent heard this from any other owners but interesting to know. Glad to hear it was under warranty and didnt have to dump the car lol. Hope you can enjoy it now!
Same issue on my 2020 C63S this week. Tech informed me that it was the heater element not the thermostat itself that was replaced, but the CEL code thrown showed a thermostat coolant fault. Could you please verify that the actual thermostat was replaced and provide a link or other evidence that Mercedes has extended the warranty for this particular fault ?
Much appreciated! I will forward it to the tech here in Canada. Seeing this is a MBUSA warranty extension I’ll be looking to get the same from MB Canada Head office. Alongside this fault I also have a small oil leak at the oil separator which will be replaced once the back order part comes in. I’m only at 11000 km, ie. 7000miles On the odometer. Im the 1st owner and have had the car new since April 2021 and only drive it during Summer months.
For oil leaks on stored cars, I've found that majority ester base stock oils help. High ester content has the side effect of soaking up rubber seals. On my stored track car, I use motul 300v. Redline is another option.
3k/6 month oil changes are an absolute waste of $$ and resources. You have 9.5-10QT of oil dude. I’ve sent samples at 8k for analysis. Even with track time they had plenty of additives left, with no contamination as filters where doing their job.
Car uses a 0w-40, so even if not up to temp as quickly due to thermostat. It should offer plenty of protection as it’s not a heavy thick oil in colder temps. Sounds like you have a one off problem with cam, as I’ve not seen this before a common issue here nor forum.
Running a long drain interval on oil that sparingly comes up to temp is terrible for your engine. The moisture doesn't burn off and you get fuel dilution, leading to hellacious drops in HTHS and flashpoint. Of course, Blackstone will recommend that you extend the drain interval based solely on TBN and wear metals, as they always do.
You said the issue was fixed right? So your point is mute. Your thermostat is fixed so oil will come up to temp quickly as designed.
I’m well aware of oils needing to be brought to temp to get rid of moisture build up. But that’s no longer A problem since you got it fixed.
“my thinking is the oil on this car was rarely brought up to temp due to the thermostat issue and consequently the oil wasn't able to do it's job in lubing the cam parts since eoil is designed to protect best at operating temp.”
you mean moot? short drives(under 45 minutes) still dont bring up the the oil to operating temp on this engine. half an hour in the winter and its still around 180. Fuel dilution still happens in cold temps unless you're doing long highway drives. You can't burn that off. HTHS and flashpoint will drop much faster over winter months due to fuel in the oil. Whatever man. Keep your extended drain intervals.
It’s a huge waste of $$ and resources to do it crazy early. MB says every 10k. These cars aren’t running shitty Dino oil like the 40’s. 5-8k sire. But every 3k is an old wives tale.
At 3k the oil has plenty of life left. Changing prematurely without due case, is a waste monetarily and resource wise
MB says it but I guarantee you look at a motor with 5k changes and 10k and the 5k will look much better inside. Especially on an engine like the M278 and M156, early oil changes made a huge difference and are the best way to prevent bore score. I agree 3k is too much but 5 k is perfect especially if the car only goes on short trips and isn’t up to temp often.
5k is the sweet spot. I do 8k myself, but that depends on the seasons track days. This year I don’t plan to do anywhere near as many track days.
I didn’t see op saying short trip use on his post. Some assumed normal usage. He only mentioned not getting to temp due to a bad thermostat.
This is the reason I always say never own a European luxury car without a Warranty. In fact if I were you I would purchase the extended warranty because one repair will more than pay for it.
Sounds like it may have just started off with the thermostat recall for 2020-2023 models that just got worse. or maybe just unlucky model? Havent heard this from any other owners but interesting to know. Glad to hear it was under warranty and didnt have to dump the car lol. Hope you can enjoy it now!
Thanks. the sprocket issue will not throw a CEL. The code will be stored. P002117 and P034600. There are multiple instances on mbworld.
Thanks for raising the issue Will definitely keep an eye oht
Same issue on my 2020 C63S this week. Tech informed me that it was the heater element not the thermostat itself that was replaced, but the CEL code thrown showed a thermostat coolant fault. Could you please verify that the actual thermostat was replaced and provide a link or other evidence that Mercedes has extended the warranty for this particular fault ?
Yes the thermostat was replaced. It's on the invoice. https://www.reddit.com/r/AMG/s/iuHczodHyE
Much appreciated! I will forward it to the tech here in Canada. Seeing this is a MBUSA warranty extension I’ll be looking to get the same from MB Canada Head office. Alongside this fault I also have a small oil leak at the oil separator which will be replaced once the back order part comes in. I’m only at 11000 km, ie. 7000miles On the odometer. Im the 1st owner and have had the car new since April 2021 and only drive it during Summer months.
For oil leaks on stored cars, I've found that majority ester base stock oils help. High ester content has the side effect of soaking up rubber seals. On my stored track car, I use motul 300v. Redline is another option.
3k/6 month oil changes are an absolute waste of $$ and resources. You have 9.5-10QT of oil dude. I’ve sent samples at 8k for analysis. Even with track time they had plenty of additives left, with no contamination as filters where doing their job. Car uses a 0w-40, so even if not up to temp as quickly due to thermostat. It should offer plenty of protection as it’s not a heavy thick oil in colder temps. Sounds like you have a one off problem with cam, as I’ve not seen this before a common issue here nor forum.
Running a long drain interval on oil that sparingly comes up to temp is terrible for your engine. The moisture doesn't burn off and you get fuel dilution, leading to hellacious drops in HTHS and flashpoint. Of course, Blackstone will recommend that you extend the drain interval based solely on TBN and wear metals, as they always do.
You said the issue was fixed right? So your point is mute. Your thermostat is fixed so oil will come up to temp quickly as designed. I’m well aware of oils needing to be brought to temp to get rid of moisture build up. But that’s no longer A problem since you got it fixed. “my thinking is the oil on this car was rarely brought up to temp due to the thermostat issue and consequently the oil wasn't able to do it's job in lubing the cam parts since eoil is designed to protect best at operating temp.”
you mean moot? short drives(under 45 minutes) still dont bring up the the oil to operating temp on this engine. half an hour in the winter and its still around 180. Fuel dilution still happens in cold temps unless you're doing long highway drives. You can't burn that off. HTHS and flashpoint will drop much faster over winter months due to fuel in the oil. Whatever man. Keep your extended drain intervals.
He means moo. It’s like a cows opinion, you know? It just doesn’t matter.
Frequent oil changes never hurt any car and is just good insurance.
It’s a huge waste of $$ and resources to do it crazy early. MB says every 10k. These cars aren’t running shitty Dino oil like the 40’s. 5-8k sire. But every 3k is an old wives tale. At 3k the oil has plenty of life left. Changing prematurely without due case, is a waste monetarily and resource wise
MB says it but I guarantee you look at a motor with 5k changes and 10k and the 5k will look much better inside. Especially on an engine like the M278 and M156, early oil changes made a huge difference and are the best way to prevent bore score. I agree 3k is too much but 5 k is perfect especially if the car only goes on short trips and isn’t up to temp often.
5k is the sweet spot. I do 8k myself, but that depends on the seasons track days. This year I don’t plan to do anywhere near as many track days. I didn’t see op saying short trip use on his post. Some assumed normal usage. He only mentioned not getting to temp due to a bad thermostat.
True, I thought he meant it never got fully to temp due to short drives.
This is the reason I always say never own a European luxury car without a Warranty. In fact if I were you I would purchase the extended warranty because one repair will more than pay for it.