Gum out High Mileage Fuel Injector Cleaner is specially formulated to remove carbon deposits from engines with over 75, 000 miles for restored engine performance and fuel economy. The more an engine is driven, the more carbon deposits can build up. Gum out High Mileage Fuel Injector Cleaner is designed for high mileage vehicles, cleaning fuel injectors, intake valves, and ports to restore performance and fuel economy and reduce emissions. High Mileage Fuel Injector Cleaner also prevents future carbon build-up on indirect fuel injectors, intake valves and ports, and combustion chamber. It is oxygen sensor safe and also safe for use in turbocharged and supercharged vehicles. It will not void OEM/manufacturer's . Directions: Add entire bottle to nearly empty gasoline tank, then fill tank with up to 21 gallons of gasoline. For best results, do not refill tank until near empty. Use every 3, 000 miles.