I know it's a lot newer, and we probably have not had enough time to tell about the long term service of the Duramax yet, but I still wonder. I want a truck mainly for long life. A lot of people tell me the Cummins is the best engine for that, but I still don't know. It was designed a long time ago, and it seems like some of the Duramax's newer technology would help it. I have heard of some already with over 400,000 on them, so I wonder which would be better for a long term engine.