so, as some of you know, i was complaining of my truck showing symptoms of a bad ficm and possible hpop...well, my ex wife had told me that i couldn't afford to do an oil change when we were married...truck ran for 15k with the same oil, started showing injector problems. parked the truck until i could afford injector. decided one day, since it's just sitting there, not burning fuel, i can change the oil. put 2 cans of rev x in the oil, started it, drove it for a while, ran fine. then is started showing symptoms of hpop/ficm issues, started looking for parts and scheduling maintenance. My brother of all people said "how old is the fuel?" and put a diesel additive in it. truck runs great now!!! Bottom line, DO YOUR DAMN MAINTENANCE ON YOUR 6.0!!!! It will save you in the long run! Also, never over think your vehicle symptoms, sometimes it's the cheapest, and easiest fix. But you guys already knew that. I just had to learn the hard way.