I'm considering buying a 2013 2500 laramie longhorn with only 36K miles. Below is the link to the blow by test,and a pic of the truck. It's a megacab, w/rambox, 6in lift with brand new wheels and tires. Retail is about 62-65k, but I'm buying for $56k. Seems to me like a GREATdeal. I'm just apprehensive because it is 9 years old, and I've never owned a diesel before. Thoughts?