As stated, any 80W-90 GL-5. Brand makes no difference... just make sure the bottle has the API "donut" with the afore mentioned information.

Mercedes recommended a "break-in" axle oil change at about 1200 miles as I recall. Being as how I am a DIYer I chose to do it myself and bought the special tool to remove the fill and drain plugs. The owner's manual specified a 85W-90 oil, but all I could find was 80W-90. I finally got a Pennzoil product number from the dealer and contacted Pennzoil. They said that that product was not sold in North America. Sheesh! Thanks DB for recommending a product for USA cars that is not sold here.

After all this I finally concluded that 80W-90 GL-5, which has an EP additive for hypoid gears was quite satisfactory. Mercedes hypoid axles are basically the same technology as those used in domestic cars, and there is no need for a "special" oil other than an ounce or two of common clutch type limited slip anti-chatter additive that you can buy from NAPA and most other parts stores for models with clutch-type LSDs like the 190E 2.3-16.

Then I had to wrestle with the manual transmission oil spec, which is SAE 20W-20 non-detergent oil. Try finding that product. After going around and around I found out that ATF was okay to use, and decided to splurge and bought Redline MTL synthetic that has the same gear oil "weight" as ATF, which is 70W-75. Gear oil "weights" are not the same as engine oils. Engine oils range from zero to 60 and gear oils from 70-140, but a SAE 70W-75 gear oil has about the same temperature-absolute viscosity characteristics as a SAE 20W-20 engine oil, and an 80W-90 overlaps the range of SAE 30 through 40 engine oils.

I went through the same drill with "Mercedes-Benz antifreeze", and it took a couple of decades to figure that one out. It was jointly developed and patented by DB and BASF, so it was not commercially available in other brands; but once the patents expired it became available in other brands and the most common is Zerex G-05. It's a HOAT type that protects solder better than current OAT types, so I recommend it for vintage cars that have copper/brass radiators and/or heater cores. It's the new "universal" antifreeze.

Duke