Driven Racing Oil Defender + Booster fuel additives raise octane levels, enhance fuel stabilization, and fight the corrosive results of ethanol. The specialty formula reduces valve stem wear and includes antioxidants to fight gum formation—as well as combustion chamber residue corrosion inhibitors. These additives help keep your fuel system clean and preserved, while improving fuel economy and protecting against detonation. Restore power and keep your older engine purring with Driven Racing Oil Defender + Booster fuel additives.