Gumout All-In-One Complete Fuel System Cleaner improves performance across the fuel system. Engine performance is affected by everything from carbon deposits and corrosion to heat and friction. This formula uses PEA (polyether amine) to effectively remove carbon deposits other products can't. All-In-One also helps extend the life of key engine parts by conditioning fuel to fight corrosion, and helps improve horsepower and fuel economy by reducing friction in the upper cylinder. Cleans direct and indirect fuel injectors, intake valves and ports, piston tops, cylinder heads, and combustion chamber. Oxygen sensor safe, and safe for use in turbocharged and supercharged vehicles. Will not void OEM/manufacturer's warranty. Directions: Add entire bottle to nearly empty gasoline tank at time of oil change. Refill tank with 18 to 35 gallons of gasoline. Do not refill tank until near empty. Repeat every 3,000 miles at time of oil change.