My 03 6.0 is has been flawless. 24,000 miles and not one problem. It is a late 03 and that probably makes a difference. The only thing I must do is let it warm up at least a few minutes before taking off. My 96 7.3 also was trouble free but much more power with the 6.0 and quieter. Both tow very well and you'll be ok with either. Much better technology with the 6.0 though. I wouldn't trade it for anything.