I am looking to buy a 1994 Dodge 2500 4x4 with a mighty 5.9 Cummins in it. It only has 70,000 miles. I have never owned a diesel engine before, but always have wanted one. What should I look for and questions I should ask the current owner. I know these engines are very reliable. I am a Mopar guy, and upgrading from my 360 to a Cummins is sounding like a good thing to do.