In 2004 I bought a F-250 with the 6.0 and it stayed in the shop more then it was on the road. I had so much trouble that Ford allowed me what I paid for it on a new F-250 in 2008. The 2008 had a 6.3 and I never had a minutes problem with it. I really don't know what to tell you except, that engine was a load of trouble. I also had a Class C motor home with a 6.0 and never had a problem. Some of the 6.0 were fixed and after that they were good engines. Ford finely found the problem and fixed a lot of them if the owners took them back for the recall. Find out if the truck was fixed and talk to the previous owner. The dealer should have his name on record. He will most likely tell you why he shed the truck.