Diff and transfer case fluid change frequency
Thread Starter
Member
Joined: Dec 2009
Posts: 85
Likes: 7
X164 GL550, F10 535 6MT
Diff and transfer case fluid change frequency
I've seen recommendations from some of you to change the fluid in the front/rear differentials and the transfer case even though MB doesn't include this in their maintenance schedule. This makes perfect sense, but how often do you recommend this be done? My car is a daily driver, no off road, no towing, sees some snow in the winter and currently at 50K miles.
Senior Member
Joined: Jan 2013
Posts: 421
Likes: 57
2021 V167
Fluid changes
I have a 2011 GL350 that I now have 102 k miles on. I have changed front and rear diffs with OE MB gear oil every 20k miles. I know some will be surprised but I change the transfer case ATF134 (235) every 10k. That fluid comes out smokey clear, diffs are generally clean but rear can be a little smokey.
The reason for my frequent changes is I tow a 30' Airstream frequently and these components are a little "tender" in my opinion.
The reason for my frequent changes is I tow a 30' Airstream frequently and these components are a little "tender" in my opinion.
Thread Starter
Member
Joined: Dec 2009
Posts: 85
Likes: 7
X164 GL550, F10 535 6MT
Thanks all. I had my transfer case fluid changed. My independent shop reported back that it didn't look too dirty and there was no sign of metal. I'll probably do it again at 100K - cheap insurance.
