I had a '05 F350 6.0L. When it was running, it ran awesome. Very fast, loaded or not. I can remember perhaps a hand full of days that it didn't have a trailer hooked to it. Had both oil pumps replaced under warrranty. The injectors started messing up. The ABS was always broke. Mileage was awful. Finally the head gasket cut lose and I sold it as is. I did like the roomy interior. Oh yeah, 4wd was kind of iffy as well. Had to lock in the auto locking hubs to get it to really work right.