I use 0W-40 lubri-moly(fully synthetic) oil in all of my family cars & trucks including the race car.
In my old 280E that I auto-crossed 6 years ago I used Mobil 1 15w-50.
On the race car (16V) I use Red-line MTL in the trans & Redline Heavy shockproof 85W-140 in the rear diff.
I also use ATE type 200 brake fluid OR ATE blue. I switch every year between the 2 as they are the same except the color.
I also use MB GERMAN factory Blue antifreeze with redline water-wetter.
Change oil & brake fluid every race! Other fluids every year.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator