YodaSyrup

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.

Plutoe

Follow the guidelines in the manual---leave the hearsay BS to ashtray cleaning and washer fluid level changes!!

alx

I would like to see those changed when the atf is changed. Ie at 37-40k miles, 100k, 150k etc...

the front/ rear diff oil remains usually clear, but that center diff oil is a different story...

KrustyKustom

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.

YodaSyrup

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.