I work on the forklift service industry, all of our work vans are Chevy 2500,3500 vans with the 6.0. They all are overloaded and get the shit ran out of them, I think since 2005 I have seen one need a rebuild and it had over 250k. We run them to 200k before replacing the van and mostly just waterpumps as the common failure. Heck ofa good engine!