Brand name: Gumout. Gumout fuel system cleaner removes carbon deposits from engine parts to maximize engine performance and fuel economy. Carbon build-up across the fuel system can reduce the efficiency of bustion. Gumout fuel system cleaner cleans the fuel injectors, intake valves and ports and also prevents future carbon build-up. Oxygen sensor safe and safe for use in turbocharged and supercharged vehicles. It will not void oem or manufacturer's warranty. 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 3000 miles. Package content: Gumout 800001367 fuel system cleaner (177 ml). . . . .