So since I've been starting to mod the car finally, I'm starting to change out the fluids.

I used the directions at slk32.com, and decided to change out the rear diff fluid. The stuff that came out was NASTY black and smelled like rotten eggs... From what I could find on-line, the OEM stuff is non-synthetic 90w. I went with Lucas 75-90w Full Synthetic lube.

Funny, old vs. new fluid looks like Guiness beer vs. Bud Light... lol

BTW, I have 52k on the car.