This is the weekend that I am changing out the POS rebuilt rear axles that I put in about a month ago. One locked up and the other was leaking grease. The quality of the replacements look much better, so I hope that they will last longer than a month. Anyway, I filled the diff with Mobil 1 synthetic gear lube after I replaced the original MB axles last month. When I drained it yesterday I was shocked to see how dirty the fluid had become. Once I got the cover off I could see why the fluid became so dirty:



Mobil 1 cleaned the entire housing. I never saw the yellow coating or the two red paint marks on the inside of the housing before. I always thought it was black. There are still a few dark patches that will probably clear up down the road. I have never seen a cleaner differential in any of the MB at our house. Wow.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold