I am shopping for an inexpensive 2008 S550 4matic. I am not shy of high miles provided that the car was taken care of. I need it as a utility car to put 50-60K mi on it yearly. What is the optimal mileage of a target car if I expect to put 100 additional miles on it in the next 2 years from the total cost of ownership (not just cost pf purchase point of view?). I have 3 local junk yards which have 1-2 cars every month to pull parts from for cheap. I am thinking between 80Kmi to 130Kmi.