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. 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.