Personally I like to turn a car every 2 years. There are several guys that do this so you will find some good deals right now on 2008-2010 cars. I would not hesitate to buy a car that is older than that but I would say 2006 or so would be my personal limit. If it is older than that I would want to know the owner and how they took care of it each weekend so it would be a local guy.