Transmission fluid advice...
I am just turning 120K miles (about 200k km) and the recommended 120K service includes: engine oil change and filter, engine air filter, fuel filter and cabin air filter, and a transmission flush, fill and transmission filter.
Local Mercedes stealer, I mean dealer, wanted $2200 for all that. My local independent garage, who I trust implicitly, is doing everything but the transmission fluid and filter for $500. Fair enough.
He told me, "I can't do the transmission fluid. Need a special tool, it has to go in at a certain temperature, and I am just not equipped to do it, I'd have to buy the tools and charge you for it. Plus, if your transmission fluid was changed at 80K (which it was), I'd wait 60K beforeI changed it, that is what pretty much every brand does. 60k."
I called the stealer again, and they want $800 for the transmission filter, flush and refill.
Short of calling other M-B dealers, which I will do, what would you do? Wait 20K more? Find an independent garage that is more familiar with M-B? Pony up and let the stealer do his dirty work?
(Note I am not a fan of this dealer. They filled my DEF fluid from a 55 gallon drum and tried to charge me for 14 half gallon bottles at $20 each. I asked for the empty bottles, and they finally admitted they fill from a drum)




$9 infra-red thermometer will do when you don't want to spend $100 on advanced scanner. Any shop hesitating spending "that kind of money" on their tools would be red-flagged in my books.
My W211 did not have ATF changed for 140k miles, while comparing the dust on magnets, I think the W212 was on factory ATF at 180k miles. No problems.
Note that 7G have converter plug, so if you don't DIY, make sure what the shop include in the price.




$9 infra-red thermometer will do when you don't want to spend $100 on advanced scanner. Any shop hesitating spending "that kind of money" on their tools would be red-flagged in my books.
My W211 did not have ATF changed for 140k miles, while comparing the dust on magnets, I think the W212 was on factory ATF at 180k miles. No problems.
Note that 7G have converter plug, so if you don't DIY, make sure what the shop include in the price.




It is not adding at certain temp, but closing the overflow plug at the temperature it is calibrated for.
The procedure sounds scary at first since there is nothing like that in the past, but once you do it, there is not much to it.
Just messy job as you have to work under the car.




It is not adding at certain temp, but closing the overflow plug at the temperature it is calibrated for.
The procedure sounds scary at first since there is nothing like that in the past, but once you do it, there is not much to it.
Just messy job as you have to work under the car.
The procedures MB have are for their own shops and simply speeds up the service time when they don’t need to wait for the old fluid to cool down for the volume measurement. Instead they have calculated what the temperature needs to be for fluid expansion to the correct level to overflow out.
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So, why not letting the old fluid to cool down to the same temperature as the new fluid is and then adding the exact same amount of the new fluid that came out?
The procedures MB have are for their own shops and simply speeds up the service time when they don’t need to wait for the old fluid to cool down for the volume measurement. Instead they have calculated what the temperature needs to be for fluid expansion to the correct level to overflow out.
2 the only way to check level is to top it off and let it overflow
3. getting ATF to 40C does not take long and you can always spend the time to check other things, or simply relax.




I got a kit from benzexpert on Ebay. It included everything and was priced reasonably.
Last edited by 300SE1993; May 9, 2018 at 11:28 AM.
I got a kit from benzexpert on Ebay. It included everything and was priced reasonably.
After this date mercedes started using different fluid.
i got the kit from rockauto but i made my own kit with with parts they offered.




The adapter might be harder to find, but transmission plug is having the same thread what oil pan plug and having spare oil pan plug, I drilled/taped it for hose connector.



