When used as a fuel additive, Sea-Foam Motor Treatment cleans Fuel Injectors and carburetor passageways while also cleaning the intake valve, chamber deposits and lubricating the upper cylinders, while also stabilizing gas & diesel fuels for up to 2 years. When used in crankcase oils SeaFoam will liquefy harmful residues & deposits. Can be used in any gas or diesel fuel blend engine, and with all motor oils - convention or synthetic.