Fuel additives keep your fuel optimized, protect your fuel system and remove leftover deposits that rob your engine of peak performance and efficiency. Part of Quicksilver's comprehensive three step fuel treatment system, Quickstor is a long terms fuel stabilizer that's easy to use—simply pour it in the tank. Each ounce treats 5 gallons and prevents regular and ethanol-blended fuel from breaking down and oxidizing. For use in all 2‐ and 4‐cycle carbureted and fuel‐injected gasoline engines. The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine Original Equipment replacement engine parts, oils, and accessories, but also works to serve all Original Equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.