Gumout's Regane Complete Fuel System Cleaner conditions fuel against corrosion to help extend the life of key engine parts, while using P.E.A. (polyetheramine) to effectively remove deposits for maximized performance and fuel economy. Oxygen sensor safe and safe for use in turbocharged and supercharged vehicles. Will not void OEM/manufacturer's warranty. 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.