The same thing..........have a mechanic check it out........but more importantly , try to form a profile of the seller........For high mileage cars, it would be beneficial to buy a car from a guy/woman who was well off financially, so you know that everything that needed to be done, has been done. Also, its even better if the person has all maintenance records, that shows that they are organized neat, and somewhat anal, and anal people USUALLY take very good car of their cars....