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. Formulated to help save gas and lower emissions by deep cleaning the entire fuel system. Formulated to help restore peak performance and reduce friction by lubricating engine parts. Formulated to help prevent ethanol deposits and inhibit corrosion. Works with modern gasoline engines such as turbo, direct inject and hybrid vehicles.