Last Friday morning at 1:30 AM I pull into a gas station in Durant OK and the old truck (1993 F350 turbo) is obviously running on seven cylinders. I'm too close to my destination to turn around so I spend the weekend in the Dallas area. Driving home approximately 350 miles I use four quarts of oil. I will try and do a compression test this evening to narrow down which cylinder. Unless I come across something strange to explain this. I think a Rebuild is in my future. I have several options. Rebuild the engine in the truck (turbo engine) or rebuild a non-turbo spare engine. It would be easier to rebuild the spare motor and then swap it out along with some of the parts for my 4x4 conversion. My questions are, Besides the rods what are the differences in the engines? Does anyone have some used rods they would like to part with? Does anyone have any other input?