KLOTZÿOctane Booster is a concentrated tetraethyl lead substitute designed to reduce pre-ignition "ping" and spark knock that results from low-octane fuel. Can increase octane ratings of gasolineÿ10+ octane numbers Maximizes performance and power by modifying burn speed Stabilizes oxygenated gasoline Providesÿupper-cylinder lubrication 16 ozÿ (Also available inÿ1 Gallon:ÿ#KL628) Not alcohol compatible