I am seriously considering buying this 1991 black M5 with 11,000 miles. The car was hit from behind but the repair was doen by the best 9and very well known) shop in town. It looks perfect, so is the whole body, paint and interior. The owner is actually a friend of a friend. There is a known extremely minor coolant leak with the mechanic said to ignore it. The only two things that bothere me are the cel phone which I just learned of the easy removal and the next is the rear seats which I wonder if can be replaced with a more useful bench seat. My last and most important concern is that if it would be expensive for me to up keep and if it is a car that i can drive all year round and on a daily basis. Anyone can advise me on this?