Lucas Safeguard 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. Fuel conditioner is completely soluble in all ethanol fuels and will not harm filters. Contains effective additives to prevent rust and corrosion associated with the use of ethanol fuels. Cleans injectors, valve seats, and combustion chambers, plus stabilizes fuel to prevent varnish and gum formation.