Spectro Ethanol Fuel Conditioner will protect any fuel system components from damage by ethanol, which is present in most fuels. It will inhibit the build-up of gums and prevent corrosion in fuel delivery systems, and will extend fuel life and allow for extended, no-maintenance off-season storage. Spectro's Ethanol Fuel Conditioner will work with fuel systems in all 2 stroke and 4 stroke vehicles, from yard equipment to classic cars. Use with every fill up for maximum protection.