with most of what has been stated by others. The engine itself I would not worry too much about. It its no big deal for them to go over several hundred thousand miles if maintained. Remember, you are still bying a truck with almost 200K on it. So dont be surprised if it needs some work. Most people that buy them dont generally use them to run to the grocery store, they work the hell out of them. This takes its toll on the truck. The stuff you are going have problems with are going to be with the truck itself and the fuel injection system. Lately I have been seeing more and more ECM, sensor, and wiring issues as these trucks age. That used to not be the issue but nothing lasts forever. Good luck.