The Hot Shots and Floats around me pretty much have the Dodge /Cummins motors. The ones who change the oil regularly and maintain their trucks are getting 400 thousand and more out of them.
The Duramax people don't seem to have many issues. Finding someone that will work on them and parts seem to be their problems.
The Power stroke folks cry more about the transmissions than anything else. Expensive to fix and not much in the way of parts on the shelf.