Buying advice sought: X5, lo vs hi miles

[edogg]

In addition to what Thrillcat said (great advice, BTW), I'd have the car inspected by a shop.

Also on the V8, check for smoking out of the exhaust. Drive the car until it is at full operating temperature (temperature gauge should be pointing at the 12:00 position). Then stop and let it idle for a few minutes like you are in heavy traffic or sitting in a drive through. Then accelerate away from the stop and check your mirrors (or have a friend watch) for blue smoke.

This is indicative of a few different things, the least expensive is about $150 and most expensive of which can cost $2000-$5000 to repair.