I just wanted to say that REV-X works !!!! My injector sticking issue had gotten to the point where I didn't even want to drive my truck, I tried everything from 5w40 to running sea foam through the crankcase to try and clean the spool valve sticking problem, nothing worked....I changed my oil last night and added the REV-X additive, I drove home with no issues because the truck was already hot, this morning the truck started way faster than normal and idled smooth, driving in to work there wasn't one issue with the truck at all, I even purposely started it and drove off so the engine was bone cold, plus it was only 55 degrees out this morning. I'm absolutely impressed with this product, I was very skepitcal but now I'm deff. a believer...just wanted to share with you guys if you're thinking about using this stuff. Oh with the oil change I switched back to 15w40 so I was putting REV-X to the test....it passed with flying colors..