Klotz® Octane Booster is a concentrated tetraethyl lead substitute formulated to increase the octane rating of gasoline up to 10 numbers or more. Helps eliminate engine damaging detonation, spark knock, pre-ignition, and pinging from low octane gasoline. Octane Booster modifies the burn speed and flash point of gasoline to create a stable combustion chamber flame front, maximizing performance and power. Stabilizes oxygenated gasoline to prevent lean-out conditions. Klotz® Octane Booster provides needed upper-cylinder lubrication that is missing in unleaded gasoline. For gasoline only.