The 6.7 is in its seventh generation and compared to the problems they had with Navistar, Ford is happy and can't complain. Early years had some issues with ceramic bearings failing in turbos according to these videos posted on You Tube by power strokehelp.com . Currently I have a 6.4 and have not had problems thus far, but my mileage is extremely low. If you get a chance check them out. Good luck with purchase. Make sure to drain water separator every month which is located under frame rail. As with all the new new trucks water in the fuel system will lead to catastrophic failure. Stick with a reputable gas station and I would recommend going to the same filling station as much as possible .