Tank additive. Designed to clean intake valves and combustion chambers and remove fuel injector deposits during the time it takes to consume one tank of gas. Protects against carbon buildup and engine knock Tank additive that cleans fuel injectors, intake valves, combustion chambers. Improves fuel economy, power, performance. One tank clean up. Cleans fuel injectors, intake valves, combustion chambers. Use every 5000 miles.