I have used this product for several years with excellent results. I drive a 2000 Toyota 4Runner V-6 and have over 160K miles. I use Lucas Fuel treatment 3-4 times per year (1500 -2000 miles) and have had no injector problems to date. My last mileage check was 20mpg city driving. I purchased this vehicle new and it runs as well now as the day I brought it home.