Quote:
Originally Posted by ohiomike
Once I used quality supposedly correct lubricant in mine and it whined after an hour of driving. I changed fluid to Mercedes brand and noise was and still is gone. Turns out M/B product has an additive package to it that other diff fluid not have.
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the old OE axle oil that MB use is very thick, more close to 180 cst when cold and has some tough friction modifiers in it - I believe its the same stuff that toyota fill their diffs in the factory with. - I recall it also having some detergents in it to keep the gears clean.
In my case - I use citgo/mystik 80W90 gear lube from oriellys - its shut up a slight coasting whine I was having in my W210. Same in the 124 - quiet and smooth.
recommended by a repair facility that just works on diffs.