I am curious how similar the qsx is to the isx found in otr trucks? I understand that the qsx is going to be john deere's big engine, and I think other manufacturers are already using it, but what im concerned is the isx doesnt have a good reputation around here. Im not just talking the emmissions crap that all the trucks/engines are suffering from. My father-in-law worked in a shop and was very disgusted with the piston design the isx had. The piston skirt or lack there of were bad about wallering the cylenders out of round and were prone to ventilating the block. The guys in that shop were calling these engines comeaparts. So does the qsx have a better piston design/reputation? I was hopeing the new deere tractors with cummins engines would be a home run like the 8960s were, just hope cummins will let deere service the engines this time. Have heard the 8970s were bad when the ecms quit deere's hands were tied and had to go to Cummins.