Lots a negative stuff here so here's a positive......I have been running my 6.0 for nearly a year now with ZERO issues.....it's stock and runs like a bear, averages 16-17 mpg and does everything I ask of it whats NOT to like about that? If this thing keeps running like it has been I think I'll get a tuner and see if THAT will help lift the heads or at least speed up the wrenching process, this fueling and driving is getting boring LOL