I have two MB's. The 1991 300TE 4matic has $7000 of factory equipment installed for the sole purpose of preventing wheels from slipping. Unless there's over an inch of snow on the ground and you're into wide open throttle, it just tracks happily along.
My 1980 300D has 77 factory HP in a 3500 lb chassis. Unless I find a fresh oil slick, I can't even turn the tires on a wet road. It's also pretty good in the snow with plain old Dunlop D60A2's.