I'm in the market for a diesel (my first one). I found a truck its an 05 with 150k miles its a good deal. The guy says it had broken rings on 1,5, and 6. 1 had no compression and 5 and 6 were 50psi low. Any opions on what might have caused this? Did some research and found that it could be injectors but he said he had them tested at dodge and they were good. He's put 2000 miles on it since he replaced the rings and honed the cylinders, it runs fine. Any thought on what could have caused this? Should I stear clear of this truck?