all of our 6.0 and 6.4 have been nothing but headaches ! multiple trips to the dealer for warranty on ele. fuel inj problems , computer issues , injector issues , and oil leaks . all ours are well under 100k , BUT our trucks idle ALOT ! possibly the problem , but why would you build a truck that can't idle for extended periods of time ? our trucks also use diesel and biodiesel , could also be the problem as when the 6.0 first came out the biodiesel was eating the tanks liner and sending it through the fuel system . and at first ford told us to pi$$ off , and after a few ph. calls to corporate ford they all were covered !