I am looking at a 07 Quadcab 5.9L 3500 DRW 6-speed truck with 112,000 miles on it. I know that I will need to look at the injectors and that the #4 injector line can work loose and break. My question are: 1. I have previously read about taking the oil fill cap off and checking to see if it smokes while the engine is running, but what exactly am I looking for? 2. Is this the mileage that the front wheel bearing start to fail? Been there done that on the 99 I currently own. 3. I looked over the dealerships version of the carfax record and the truck has had 65,000 miles put on it in the last 10 months, something to be concerned about? The truck is about 600 miles (11hrs) away and I want to be prepared at what to look for before I drive that far to buy it. Any other suggestions would be greatly appreciated. Thanks.