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Ethanol fuels can leave deposits on intake valves and fuel injectors that reduce fuel economy. Rust and corrosion may also form and damage fuel system components. Use STP® Fuel System Cleaner for Ethanol Fuels to prevent rust and corrosion.


  • 5.25 fl. oz. bottle treats up to 21 gallons of gasoline.


Use every oil change or 4,000 miles.


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