I have 293 thousand on one of my 7.3s all stock drive it every day. Haven't spent over 150 bucks on it at one time and that is usually oil changes. One cam sensor,one injection pressure sensor and one injector wiring harness. Thats it nothing more. My other 7.3 has 120 thousand, has chip,cold air kit, 4 inch exhaust, have only replaced cam sensor. I only use it to pull my 46ft race trailer. The chipped truck definitly has more power but it is a stick tranny also. I only hope the new Ford diesels are going to be as reliable as the 7.3s has been.