To answer your question someone with a car that has over 150,000 miles or so needs to pipe up. We had a 1999 C230 Kompressor Sport and leased it for three years and 45,000 miles. Actually drove it 46,000 and change. It was solid as a rock, with not a single rattle, shake, gadget or mechanical device failure the whole time. We did have an incident where my daughter ran over a writhing tire tread from a truck that came off directly in front of her while on the highway. This resulted in the outside air temp sensor being knocked out of commision, the cover below the engine getting damaged and, as it turns out later, the insulation over the transmission housing coming loose. The first two items were repaired under insurance and the last one was done as a warranty item as is appeared later.
Anyway, the car was a pleasure to own and operate for the three years. If it was a manual transmission, and got better gas mileage we would have kept it. I am not a fan of automatics and we gave this one a try to see how they were. I was not impressed. The gas mileage is most likely a result of the responsiveness of the engine - both of us enjoyed pressing the accelerator so much we ended up averaging about 21 mpg, which is not much for a car of that size. We get better with the 5-speed 300E, a much bigger car with similar performance.
So, the car was very solid for the first 45,000 miles and it seemed like it would go for quite a while. It never needed any oil between 5,000 mile change intervals (Mobil 1) and always started and ran flawlessly. Hope this helps, and that someone with a high mileage car pipes up. Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)