Welcome to SDD.com - The 6.0 is a great motor if maintained and doesn't have nearly as many problems as some people think. One of the most important things is to change the oil and filters at regular intervals - Also NEVER run it out of fuel, thats the best way to kill a set of injectors. Getting on the throttle now and then keeps the egr and turbo clean/ its built to be run. Take care of it and it should give you years of great service
48k with mine and i still can't get rid of the grin