the 6.0 being a new engine had many many problems in its first year. Ford ironed them out with revised parts after they learned of the problems. Could still be first year trucks floating around without revised parts. These trucks are probably the ones still encountering problems because the faults haven't been correct yet.
Mine is an 03 6.0, still running Factory Turbo, All 8 injectors and Factory Head Gaskets. 142,*** Miles as of this morning when I parked it at work. Still running strong. I bought it 7.5 years ago, from the original owner. Was an older couple, and had maintenance done exactly on time, every time at the dealer. I've done the same. Oil and Motorcraft filter every 5000 (now running synthetic, but still change at 5000), and Motorcraft Fuel Filters every 10000. I think the biggest thing has been NO TUNER!!!!! Have no plans on ever getting rid of this truck.