Clay says "I tried 2 bottles of your oil additive last night when i changed my oil and this morning the truck (2003 ford 6.0 diesel) ran much smoother while cold. I was having injector stiction issues and 5 injectors showed to be misfiring when cold. As you may already know the 6.0 diesel injection system works with high pressure oil from the crank case to fire the injectors. I was about to have all 8 injectors replaced which runs about $2,200.00 just for the parts. Thanks to your product, I will be seeing many more miles on these injectors! Thank you!"