Only few things that would have me a little worried would be the CP4 fuel system(but that is nothing that proper maintenance and maybe some lubrication additives every now and then can't avoid) and the plastic inter-cooler pipe. The diesel mechanic that my father in law uses for his 2003 Powerstroke has said he replaces more then a handful of these every summer due to the south Texas heat. This may not be an issue for most, but you might want to consider it depending where you are from in Texas. Luckily H&S has a fix for it.
11-16 Ford 6.7L Intercooler Pipe Upgrade KitI am not sure if this is the same for the new 2017 trucks. Other then that, solid engine and trans.
