My former Mercedes Mechanic told me he services two cars that each have over 400,000 miles. I never saw them myself, but I'll take his word for it.
One was an early ('88 or '89???) 300CE and the other was a 1992 400E.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".