I have used Rev X in the past and had great results. I had a stiction issue with my very first 6.0. Started about a year after owning it in the winter months. Ran the 2 bottles of Rev x and switched to rotella t5 at the same time from the standard rotella I was using before. I only used it for that one oil change and decided to see how the truck acted without it the second time and the stiction never came back.