This special STP® formula contains the highest level of detergents of all our fuel system cleaners. It helps to save gas* and lower emissions by deep cleaning your entire fuel system to restore its optimum operating condition. The advanced formula lubricates engine parts, such as piston rings and cylinder walls, and helps clean unwanted deposits caused by today’s ethanol blended fuels. This simple all in one product also helps to prevent the harmful effects of rust and corrosion caused by moisture. It contains jet fuel, a high-quality carrier of active ingredients.