Hi all. Just lucked into this beaut and the manual simply states "Hypoid gear oil SAE90, 85W90."
It's the same manual as for the 560 SEL and SEC, and for those cars the rear diff oil is "Hypoid gear oil SAE 90 for limited slip differential"
So I think it's safe to assume that the limited slip additives are not necessary.
I'm mostly interested in smooth low-temperature operation and low friction. So I suppose I should just look for a 75W90 with the lowest low-temp viscosity?
It's the same manual as for the 560 SEL and SEC, and for those cars the rear diff oil is "Hypoid gear oil SAE 90 for limited slip differential"
So I think it's safe to assume that the limited slip additives are not necessary.
I'm mostly interested in smooth low-temperature operation and low friction. So I suppose I should just look for a 75W90 with the lowest low-temp viscosity?