Never heard any bad about the 7.3 It was the 6.0 that had probleem-o's. Then there's the human factor, i.e. engine care, driving habits, etc. The 6.6 LBZ or LMM Dura is a hell of an engine, but I know guys that set their Banks, Bullydog, Egde, whatever, on "Extreme" and scatter them all over...