Family Ford Diesel problems

I have experienced Ford diesel problems first hand. My Uncle has a 2005 FORD F-550 6.0 diesel, and he has had nothing but trouble with it. He delivers cattle supplements with it and begins his day by starting it to let it warm up, but one morning he started it and as he walked away it suddenly died. So it set for awhile until we got it into a mechanic, and it turned out that the low pressure oil pump went out and stripped out the threads holding it in place on the engine. Two weeks after being fixed and running good the same thing happened and we are just going to fix the truck and sell and get rid of the head ache. The truck was very useful while it was running, but just a pain when it wasn't Thanks Again!