It really depends on whether you or the previous owner spent the extra dollars to bullet proof the 6.0. For four and a half years my 2004 6.0 was a hauling beast and loved it. Then kaboom the turbo got toated when the coked up EGR valve dumped **** into the turbo. $6,000 in repairs under warranty. 13 months later same thing and driven per Ford's recommendations. Fixed it, sold and bought a 2002 7.3. DW just didn't trust it and the $3,000 to do the EGR delete, ARP head studs etc.(you have to lift the cab off the chassis and that wasn't going to happen.) Yup the 7.3 is noisier, not as peppy and the transmission not as smooth but 90K later it hasn't missed a beat. With the right mods the 6.0 can be made dependable if you don't have a smog check state but who knows what has happened in the past. Now I just take my time, watch the EGT's and trans temp and know I'll get there. Whatever PSD you look at get a good gauge setup. Temperature is the enemy.