Heres the problem my dad is buying me a truck but he thinks high mileage diesels are bad. I found a 1999 24v Quad Cab 4x4 with 243k on it for $9995. I told him they will last a long time and I will be doing a new transmission and other stuff to it anyways down the line. How long do these motors last without any mods and with mods? Any information will be helpful.