I've done that with a brand new car that I had no intention of buying, in fact the dealer told me to. I would have done it no matter what because I was just trying to see if I would have gone with a 4 cylinder over the 6 for the amount of money they wanted to cut from it. I didn't go for it because it was a closeout model that wasn't at a good closeout price. They wouldn't negotiate enough. Eh, wouldn't have had the intake gasket issues though. What would ya do? I don't plan to ever buy a brand new car ever so I'll always be driving what someone else abused at sometime or another, or perhaps all the time, but if it's high mileage and it still performs solidly and it's cheap then it's all good until its dead. I will take advantage of people who still believe that 150,000 miles is the final miles of a vehicle with a reputable engine. I know enough people who bought cars near 200,000 miles that kept their car until it rusted or they just felt like something else.