I am not sure if everyone would agree or not, but if I were purchasing used whether from a dealer or private I would insist on a 3rd party inspection ( you pay for it). You will want it done by a good Indy mechanic who knows the car. If the dealer refuses to allow you to have it inspected walk away. There are plenty of other cars out there for purchase. If you do a search or post on the local bmw club boston chapter you'll get some good replies as to who to use. As for the car, with the year and the mileage you can expect the usual in the coming months / weeks and that's why you want the 3rd party opinion. It'll be the best $200 you spend.