my 7.3 has 206k just regular stuff calipers 80 bucks 41 core parts are cheap .6.0 are junk 7.3 non turbo have no power try to find a turbo 7.3 as they don't make the motor unless it in ambulance they are the best motor's for uses as it really international motor i have seen then over million miles and 300-400 k no issues you just need to take care of them will last for ever.i can pull my 30 ft camper loaded up, going up 6% grade with 206k on it like nothing ...don't waste your money 6.0 find turbo 7.3 parts cheaper and easier to work on "besides injectors which are expensive"