STP Ultra 5-in-1 Fuel System Cleaner contains high-performance detergents and friction modifiers that come together to form a one-source solution to help to save gas by deep cleaning the entire fuel system, restore peak performance, reduce friction, prevent ethanol deposits and inhibit corrosion. Product Features:Formulated to help save gas and lower emissions by deep cleaning the entire fuel systemFormulated to help restore peak performance and reduce friction by lubricating engine partsFormulated to help prevent ethanol deposits and inhibit corrosionWorks with modern gasoline engines such as turbo, direct inject and hybrid vehiclesCompatible with cap-less gas systems