Raises the octane in unleaded fuels, reduces valve seat wear and protects against the corrosion deposits common with today’s gasoline. Like Driven Carb Defender and Injector Defender Fuel Additives, this product features corrosion inhibitors that control combustion chamber residue, as well as clean and preserve surfaces of the fuel system. By cleaning and controlling combustion chamber and intake valve deposits, Defender + Booster Fuel Additive protects against detonation and improves fuel economy. The additive is ideal for all carbureted and fuel injection vehicles, including motorcycles and marine engines. Each 10-ounce bottle treats up to 25 gallons of gasoline, and regular use has been proven to lower emissions.