its not really the mechanics that you have to worry about in these new cars, its the electronics, which instead of deterioration over long miles, deteriorate over time. id rather see it go for two years with 20,000 miles without anything failing.

__________________
1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350