GLC Class (X253) Produced 2016-2022

Help! Wrong Transimission Fluid need immediately flush out!

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Old Jul 24, 2025 | 01:03 AM
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dansu92833's Avatar
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Help! Wrong Transimission Fluid need immediately flush out!

Just changed my 2020 GLC300 Transmission fluid by drain and fill.
The fluid I did was Pentosin 134 FE 5L (Thanks to google AI ....)

Didn't know that is for 7G not 9G. Until did research with other sources FK!

I'm ordering Mercedes MB236.17 D971 10L to replace it. ( Yes I also purchased a new filter pan....X_X)

Questions:
How many liters to flush out all of the wrong fluid in order to make correction?
How to flush out? Are there PDF instructions for the flush procedures?
Any ATF additives recommend for this 9G tronic?
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Old Jul 24, 2025 | 08:46 AM
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'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
That's too bad. I can't comment on procedures, but I'd be careful about additives. They can dilute the additive packages from the oil manufacturer and put it out of spec.
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Old Jul 24, 2025 | 02:47 PM
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2018 GLC 4MATIC
Originally Posted by dansu92833
Just changed my 2020 GLC300 Transmission fluid by drain and fill.
The fluid I did was Pentosin 134 FE 5L (Thanks to google AI ....)

Didn't know that is for 7G not 9G. Until did research with other sources FK!

I'm ordering Mercedes MB236.17 D971 10L to replace it. ( Yes I also purchased a new filter pan....X_X)

Questions:
How many liters to flush out all of the wrong fluid in order to make correction?
How to flush out? Are there PDF instructions for the flush procedures?
Any ATF additives recommend for this 9G tronic?
Search this forum, you will find all details including pictures and official work instructions.
Reply

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