Safeguard Ethanol Fuel Conditioner with Stabilizers from Lucas Oil provides protection against issues that may arise when using ethanol-based fuels. The formula is entirely soluble in all ethanol fuels and contains effective oxidation inhibitors to stabilize fuel and prevent varnish and gum. It is available in 5.25oz. (No. 10670) and 16oz. (No. 10576). The fuel conditioner is safe to use with both two-stroke and four-stroke engines and fuel mixtures such as E-10, E-15, E-85, pure ethanol, and others in between, including gasoline. When applied to ethanol fuel regularly, users can expect cleans injectors, valve seats, combustion chambers, and other critical fuel components.