Just saw my Mercedes Transmission Specialist two days ago to seal a leak I had and he said just to use any ATFIII or higher as they are all good enough now for these w124 transmissions. He was using a Merc/Dexron IV fluid that came in a gold 2 gallon container (Valvoline I think). Just do a search for your car and approved Trans Fluid. You'll get a lot of options.