Cataclean is a patented EPA-approved complete engine, fuel, and exhaust system cleaner that reduces carbon build-up and cleans cylinder heads. Cataclean does not alter fuel composition and is safe for gasoline, diesel, and hybrid engines. Testing at an independent emissions testing facility showed using Cataclean can lower your total hydrocarbon emissions (Performance results are dependent on driver habits and vehicle condition.) Use Cataclean in small engines, such as lawn mowers, blowers, weed trimmers, and more. Also great for Powersports, such as UTVs, motorcycles, jet skis, and more. Perfect to use one 8 ounce bottle in a fuel tank (if approximately 1 or 2 gallons) then use/run as normal for at least 15 minutes and refuel when necessary. For best results, we recommend adding one 8 oz. Cataclean bottle into approximately 1-2 gallons of fuel (16:1 or 32:1 mix ratio) and after any prolonged storage.