Check the listing for details. Lucas 10670 Safeguard Ethanol E10 E15 E85 Flex Fuel Conditioner 5.25 Oz. Bottle. Condition: New, Made in United States. Listed at 13.95 USD. Lucas Safeguard ethanol fuel conditioner cleans up ethanol issues. Whether you use E-10, E-15, E-85, pure ethanol, or any mixture in between, including gasoline, it can be stabilized to prevent varnish and gum formation. Safeguard cleans injectors, valve seats, combustion chambers, and other critical fuel components. It combats deposits and protects your engine's lubricants from the harmful effects of alcohol combustion. Plus, it's completely soluble in all ethanol fuels, will not harm your filters, and contains effective additives to prevent the rust and corrosion associated with ethanol fuels. Condition your fuel with a product specially formulated for problems with ethanol--Safeguard from Lucas Oil.