Say goodbye to stiction and hello to smooth engine performance with REV X Original Stiction Fix! If you're the proud owner of a HEUI-equipped 6.0 or 7.3 diesel engine, you know firsthand the frustration of dealing with stiction. But with REV X on your side, you can rescue your engine from this pesky problem once and for all. Ultimate replenishes or replaces vital lubricity and cleaning properties lost when making ULSD (ultra-low sulfur diesel) fuel. It includes a deep cleaning detergent to keep your fuel system & injectors clean and a stabilizer to keep your diesel fresh for up to one year. An increase in cetane, up to 12 points, restores lost performance and fuel economy.