joe p - to answer you questioin -
I have a W124 1993 300E (M104 3.2)., with 136,000 miles.
It runs great, looks almost brand new, leaks oil terribly bad at the right rear corner of the head, shifts perfectly and smoothly, except that it goes into reverse real slowly, and the a/c is factory R134a and is the coldest a/c I've ever had in any car.
The car has had dealer service exactly according to the maintenance book with oil changes every 3,750 miles since brand new. Even the brake fluid and radiator coolant has been replaced every 2 years and 3 years, respectively.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".