I've been beaten!

1987 190D 2.5 Turbo 295,000 miles on original not rebuilt motor, trans, turbo - everything.

I get from 27.6 to 45mpg c/d depending on conditions.

oil, and change intervals;
Rotella Synthetic 15w40 or Valvolie synthetic 15w40
only MB genuine filters

3,100 mile intervals.

I drive hard too.