Interesting. I was filling up today at a place in Issaquah called the Grange, where they sell Centex gasoline. I was in there looking for a fuel system cleaner and found one by Amsoil that I threw in the gas tank today before filling up the tank with 15 gallons of gas. I also found a Oil Cleaner by Amsoil as well that you throw in the oil just before the oil change and then let it idle for about 10 minutes then drain your oil. I have used Amsoil trnas fluid before for my GM truck but other than that it has always been to expensive for my budget. Come to think of it now, I may wait on the oil cleaner as I am getting a Blackstone kit for OA hopefully in the next couple days.