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, 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, Provides needed upper-cylinder lubrication that is missing in unleaded gasoline, Not alcohol-compatible, Made in the U.S.A.