Just thought I would let you know the success I have been having since using your Complete Fuel Treatment. I have been using this in my 6.0 ltr. Ford vehicles and have not had any soot related issues with them. Before using your treatment, I had tried several different fuel additives but with very limited success. Managing a fleet of 100 emergency vehicles down time is paramount, and your product has helped me meet the ever-demanding needs of our business. Complete will now be our only fuel treatment used in our entire fleet. Thanks for making such good and progressive product.