My 2003 Pete has 725,000 miles on it using 3 or 4 of your products on a regular basis. This particular truck has had 2 oil changes using your product and one of the oil changes was by one of my drivers and I wasnt very happy about it. At any rate, your products are the best thing for any diesel truck. I also use your fuel treatment regularly by priming my fuel filters with your treatment only. I have yet to have an injector problem. The truck, by using your grease only, has all original U-joints and anything greasable. I just thought I'd write this letter to let you know that I know your product is the best in the world.