Gumout Regane Complete Fuel System Cleaner conditions fuel against corrosion to help extend the life of key engine parts, while using PEA (polyetheramine) to effectively remove deposits other products can’t, for maximized performance and fuel economy. Even high-quality fuel can leave behind carbon deposits and corrosion from ethanol and water. Gumout Regane Complete Fuel System Cleaner cleans direct and indirect fuel injectors, intake valves and ports, piston tops, cylinder heads, and combustion chamber. It conditions fuel to fight ethanol and water corrosion, and also prevents future carbon build-up. Provides maximized performance and fuel economy in one fill-up, and reduces emissions. It is oxygen sensor safe and safe for use in turbocharged and supercharged vehicles. It will not void OEM/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 3,000 miles.