I'm in the same boat with my '89 300E sedan (which does just qualify). I am about to buy a new car (unfortunately it's a kia rondo
for my wife and kiddies). The 3500 I would get is more than my car with 250K miles is worth but I not sure I'll do it. Just had the head done less than a year ago and mechanically it's solid except for an nagging sporadic AC issue which is currently driving me crazy - maybe even crazy enough to get rid of it!