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. Our product is completely soluble in all ethanol fuels and will not harm filters. Lucas Safeguard® Ethanol Fuel Conditioner with Stabilizers contains effective additives to prevent rust and corrosion associated with the use of ethanol fuels.