Make sure the car has been serviced and transmission and diff oil has been regularly changed on the car. Look for radiator coolant leaks and start motor is a common issue along with battery dying dying. Check for oil leaks under the car protector covers, you see a drop of oil, find the leaking source or don't buy the car if you don't have a good indy. These are good cars if they are maintained not according to BMW standards, if you know what I mean.