Lucas Oil SafeGuard&trade, Ethanol Fuel Conditioner with Stabilizer - Lucas Safeguard&trade, Ethanol Fuel Conditioner with Stabilizers was developed to specifically address issues associated with using ethanol based fuels. This applies to E-10, E-15, E-85, pure ethanol and any mixtures in between including gasoline. Lucas Safeguard&trade, is completely soluble in all ethanol fuels and will not harm filters. Lucas Safeguard&trade, Ethanol Fuel Conditioner with Stabilizers contains effective additives to prevent rust and corrosion associated with the use of ethanol fuels. Cleans injectors, valve seats, combustion chambers and other critical fuel components Stabilizes fuel and prevents varnish & gum formation in ethanol and gasoline Combats deposits and protects your engine oil lubricants from the harmful effects of alcohol combustion 1oz treats 5 gallons of ethanol fuel.