Liqui Moly valve clean protects against corrosion in your vehicle's fuel system. A combination of active agents, specifically developed to clean the intake valves and the combustion chamber of port injected engines, do the dirty work for you. Suitable for use in all 4-stroke gasoline engines—with or without turbochargers—Liqui Moly valve clean provides safe interaction with catalytic converters and particulate filters (GPF).