This high-tech additive removes residues and deposits from your engine's valves, keeping the fuel system and intake system clean. Just add Liqui Moly Valve Clean to your tank every time you fill up. You'll enjoy better gas mileage, lower emissions and reduced pinging, knocking and hesitation. It works with turbocharged engines and is safe for oxygen sensors and catalytic converters. Environmentally-friendly and suitable for regular or high-octane gas. 150ml bottle with fill nozzle treats 1 tank of gas.