I am looking at parting ways with my K20 and getting a Blazer with a 6.2. I found an 83 with 170K miles for $1300. What is the life span of a diesel? What should I be looking for? I have to convince(sp) my wife this is a good idea! I don't tow or carry heavy loads. No more than camping/hunting gear. What about elevation? I live around Denver and like the mountains. I also would like to be able to drive from Denver to Kansas City. Thanks in advance!