I have a 03' f-250 6.0 diesel and have had other 6.0 work trucks, they are known for egr cooler issues , head gasket failures,injectors, and some turbo problems. But if you find one with the kinks worked out they are great motors, do your research though. 04 and 05 are probabaly the 2 years with the most known problems. I have done alot of PM on mine,regular oil changes (synthetic), fuel filters often, egr deletion , and coolant filtering,has had a redone ficm and pcm.some injectors replaced. Its got 110K and gets used hard, been a good truck I wouldnt recommend programmable performance tuners though, Just a chip and a cold air intake and exhuast .