Rear differential oil
If your car is euro it probably has limited slip. If it does it will probably have a little tag on the right rear side that says something like sperrdifferential. Which means that it is limited slip.
Mercedes only sells universal oil now, but they used to sell sperrdifferential oil which was limited slip oil.
I put the universal oil in a sperrdifferential and you can feel the limited slip kick in. So I think its ok to just use the universal mercedes oil.
I have the part number for the actual sperrdifferentialol its
A000 583 09 04 I specified it to Phil at mercedesshop, and I still got the regular univeral oil which has mercedes part number of 001-989-17-03-10 or the mercedes shop number of z8010-70053. I guess that the old sperrdifferentialol was superceded.
I hope this information helps, Feel free to email me about it if you need more info.
No Benzes in the stable at the moment, but itching for one again.
Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold