Purpose and Specifications

LIQUI MOLY Octane Booster 21280 is a powerful fuel additive designed for gasoline engines, boosting octane levels to unlock your engine's full performance. This 200 ml can treats up to 50 liters of fuel, optimizing combustion right away for better torque, quicker acceleration, and more driving fun. It cleans the fuel system and injection nozzles, preventing costly repairs, and protects exhaust valves in classic cars. Perfect for all 2-stroke and 4-stroke gasoline engines, especially in motorsports.

• Boosts octane number for smoother high-speed running without knocking
• Improves fuel efficiency and engine power in everyday and racing conditions
• Cleans fuel system and intake ports for reliable performance
• Compatible with all gasoline types, including E10

Mix ratio: One 200 ml can per 50 liters of fuel. Add directly to the tank before filling; it mixes automatically. Store in a cool, dry place with a shelf life of up to 3 years unopened. Ideal operating temperatures from -10°C to 40°C.

When to Use / Replace?

Use before high-performance driving, racing, or when you notice engine knocking, sluggish acceleration, or reduced power. Add every 3-5 tank fills (about 5,000 km) for track days or tuned engines to maintain peak performance and cleanliness. Not for daily road use due to racing formulation—replace additive bottle after each use or every 12 months once opened.

Frequently Asked Questions

Is LIQUI MOLY 21280 safe for my daily driver?
It is optimized for racing and high-performance use on 2- and 4-stroke engines. For street cars, consider milder additives like Speed Tec for regular maintenance.

How much performance gain can I expect?
Expect noticeable improvements in torque and acceleration, especially in low to mid-range speeds, with up to 2-4 octane points boost depending on base fuel.

Can it damage my catalytic converter?
Yes, it's fully compatible and tested with turbochargers and catalytic converters when used as directed.