I was at the local GMC dealer about an hour ago, and i helped a guy i used to work with pull a LBZ out of a truck. It melted the injector tips in 4 or 5 cylinders; major damage - melted metal all over the tops of the pistons! The truck had 6 km! not 600 or 6000 - 6! it was cool got to see inner workings of a duramax!