Motor Medic 12 oz. Lead Gas Additive. It is a valve seat anti-wear additive that ensures proper lubrication of valves and upper cylinder areas for engines built for leaded gasoline. Compatible with lead or unleaded gasoline, it protects against power loss, improves fuel economy, and maintains system cleanliness. Ideal for RV's, off-road equipment, boats, cycles, tractors, lawn mowers, and snow blowers.