2021 Mercedes C300 - 9spd transmission fluid recommendation
- Thread starter tonynca
- Start date
If MB 236.17 is the proper specification/approval, this is the official list:
https://operatingfluids.mercedes-benz.com/sheet/236.17
Those are the fluids that meet the spec per Mercedes-Benz. I would use one of them.
The Liqui Moly ATF 1950 product is not listed. I would probably refrain from using that fluid for that application.
5 liter jug of the Genuine MB fluid isn't priced badly:
https://www.autohausaz.com/pn/001989920311
https://operatingfluids.mercedes-benz.com/sheet/236.17
Those are the fluids that meet the spec per Mercedes-Benz. I would use one of them.
The Liqui Moly ATF 1950 product is not listed. I would probably refrain from using that fluid for that application.
5 liter jug of the Genuine MB fluid isn't priced badly:
https://www.autohausaz.com/pn/001989920311
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This. Pretty easy.
edyvw
$50 site donor 2025
100%.
Yeah. When you have at least two electric pumps (and possibly 3) in your trans, I don't think you want to be trying other fluids.
JTK
$100 Site Donor 2025
If this is just a 9G-Tronic, it's got one E-pump, but there's nothing overly exotic or special with the unit. It's been around for awhile. Like said, anything suitable for MB 236.17 use should be good to go.
Are you intending to replace the pan as well?
Are you intending to replace the pan as well?
Any improvements? I don't like that during a rolling stop, if I add a bit of gas, the transmission clunks a bit. It doesn't smoothly engage. Only 44k miles on the car.
JTK
$100 Site Donor 2025
Will you be doing the work yourself?
Post back with how the old fluid and pan internals look if you can please!
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Has the fluid level been verified?
Yes.
Yeah if my hands are clean enough. This looks like a messy job.
No why would it need to be? We bought the car CPO from a dealership.
Sometimes they develop leaks. Sometimes the level isn’t correct from the factory.
There is no leak. I won’t be opening the drain plug until I service the transmission. That’s a weird assumption unless there’s wide spread proof.
This - there is a procedure on the scan tool to fill these - very sensitive to level, I think shift improvements are more from being at the correct level.
The guy at FCP used the scan to read the fluid temp while filling up the transmission. That was all he used the scanner for.
There’s a bleed procedure. Also, using the ultrasonic tool is the preferred route for correcting the level.