each motor lasted about 21000 miles. They say that I apparently have fuel in my oil, bent # 8 rod, and had to replace the primary radiator (leaking) they found a bulletin on this. These were both new trucks, after a few thousand miles the trucks began jolting randomly as if the tranny had failed (it felt as if someone rear ended you at about 60 mph) and the dash intrument lights would blink sometimes changing the milage etc. I bought the first truck in july 07 and it failed in oct 07 now I'm sitting in CA waiting on a motor to be shipped for this truck. Neither of the trucks ever registered an increased temperature etc, and both started knocking before failing. anyone esle seeing anything like this???