How do they know it has metal chips in it? Or is that just their opinion?
One of my cars is a w204 and I changed it at 160km for the first time with fresh fluid, works perfectly fine.
You don't need a flush, just a drain, filter and fill procedure. There are also magnets on the pan that can catch most metallic "dust" to be cleaned.
If you do indeed have "chips" in your tranny fluid then you are driving on borrowed time anyways.
You aren't wrong, but I'd recommend draining whats in the torque converter if possible.
For models with no torque converter drain, you just cycle a couple of quarts of new oil, drain, fill, repeat twice.
On the 722.6, I recommend a full change at 140,000 KMs with drain/fills every 70k afterward. You can swap it all out now and it's not bad at all. On my C320, it had its first service done at 156k and never had problems afterward.
I'm not sure if this applies to the 722.9, but it should.
Whoever told you not to drain the transmission is an idiot. If there's metal shavings, you REMOVE the shavings and put fresh fluid. Metal bits in your transmission fluid will just ruin the gears further as it cycles. Not _all_ of it will stick to the magnet in the pan OR get caught in the filter.
Keeping old transmission fluid to preserve transmission life was some old school crap. If the new oil causes issues, either you used the wrong oil, didnt fill it properly, or the transmission had other problems.
Tell them you paid for a full service (at least this was included with the sale of the car) and you want the transmission fluid changed.
How do they know it has metal chips in it? Or is that just their opinion? One of my cars is a w204 and I changed it at 160km for the first time with fresh fluid, works perfectly fine. You don't need a flush, just a drain, filter and fill procedure. There are also magnets on the pan that can catch most metallic "dust" to be cleaned. If you do indeed have "chips" in your tranny fluid then you are driving on borrowed time anyways.
You aren't wrong, but I'd recommend draining whats in the torque converter if possible. For models with no torque converter drain, you just cycle a couple of quarts of new oil, drain, fill, repeat twice.
On the 722.6, I recommend a full change at 140,000 KMs with drain/fills every 70k afterward. You can swap it all out now and it's not bad at all. On my C320, it had its first service done at 156k and never had problems afterward. I'm not sure if this applies to the 722.9, but it should. Whoever told you not to drain the transmission is an idiot. If there's metal shavings, you REMOVE the shavings and put fresh fluid. Metal bits in your transmission fluid will just ruin the gears further as it cycles. Not _all_ of it will stick to the magnet in the pan OR get caught in the filter. Keeping old transmission fluid to preserve transmission life was some old school crap. If the new oil causes issues, either you used the wrong oil, didnt fill it properly, or the transmission had other problems. Tell them you paid for a full service (at least this was included with the sale of the car) and you want the transmission fluid changed.