Ok, guys, it's been a while since I've posted on here, but I finally had my truck looked at by an actual Ford diesel mechanic. I put on a new oil filter, and did my own oil change (Rotella 15w40), we started it up with it hooked up to his computer, and noticed that it was burning a decent amount of oil. At that same time, a misfire or something showed up in cylinder number 5. So, he was thinking that it could be a bad o-ring, bad injector, or in the worse case scenario, a hole somewhere causing the oil to leak into the fuel system? I got ahold of another mechanic who said that he was pretty positive that it was a bad injector on cylinder 5. Have any of you guys ever had this problem, and what were the symptoms you had? It's causing mine to have a delay in the start/hard start depending on temperatures outside. Do you guys think I should just go ahead and buy a new injector, and have it put in, or should I sell the truck? I'd love to get it fixed up, because it's a 99 and has a lot of potential. If you need more info just go ahead and ask me.