Klotz KL-628 Higher Octane Booster – 1 Gallon
Updated June 8, 2026
The Klotz KL-628 Higher Octane Booster is a concentrated fuel additive formulated to increase the octane rating of gasoline by up to 10 numbers. It serves as a tetraethyl lead substitute, providing upper-cylinder lubrication that is missing in unleaded fuels. This synthetic octane booster modifies the burn speed and flash point of gasoline to create a stable combustion chamber flame front, maximizing power and throttle response while eliminating engine-damaging detonation, spark knock, pre-ignition, and pinging.
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How It Works
Klotz KL-628 works by raising the Motor Octane Number (MON) of gasoline through a concentrated synthetic formula. It adjusts the fuel’s burn rate and flash point, ensuring a controlled flame front in the combustion chamber. This reduces knocking and allows for more aggressive timing, improving acceleration and overall engine performance. The additive also stabilizes oxygenated gasoline to prevent lean-out conditions and provides the lubricity that modern unleaded fuels lack.
Key Benefits and Application
This 1-gallon container treats up to 128 gallons of gasoline at a typical ratio of 1 ounce per gallon to raise octane by 2.5 numbers, or up to 10 numbers with increased concentration. In addition to octane boosting, it cleans fuel injectors, carburetors, and catalytic converters, and acts as a fuel stabilizer preserving gasoline for 6–16 months during storage. The product is not compatible with alcohol-based fuels and is intended for use in motorcycles, cars, ATVs, UTVs, and other high-performance engines.
Installation Notes
Add Klotz KL-628 directly to the fuel tank before filling with gasoline to ensure proper mixing. For octane boosting, use 1 oz per gallon of fuel; for storage stabilization, use 1 oz per gallon for up to 8 months of preservation. Always consult your vehicle manufacturer’s recommendations regarding fuel additives. This product is not compatible with alcohol-containing fuels such as E85 or methanol blends.
