Just bought a 2002 F 350 CC 4X4 LB,SRW,7.3 Turbo. 101K on the clock, but only 65K on the motor. According to the dealer, the previous owner ran it without a filter element, and trashed the motor so they replaced it with one out of a wrecked truck. This truck has a clean Carfax. This is my first diesel truck, so what do I need to do to get the most miles from it? It will be used mainly to pull my 5th wheel trailer, and some light hauling from HD, or Lowes. I read on one of the forums about putting a qt of cheap oil in every tank of fuel. Is this necessary? Thanks in advance guys, I got alot of info from this site before I bought!