Sierra 18-9777 eGuard Ethanol Fuel Treatment 1 Gallon - Sold in Increments of 4 Sierra 18-9777 eGuard Ethanol Treatment is sold in increments of four - minimum order quantity is 4 1 gallon bottles. Stabilizes E10 gasoline for up to 12 months Prevents fuel system corrosion from water attracted by E10 fuels Cleans fuel system and improves performance Contains a non-alcohol water remover that helps to reduce the chance of phase separation Bottled in easy to use precision measuring pkg Safe for use