Wynn's Injection System Purge is a cleaning product to remove dirt & deposits from petrol injection systems & to clean inlet valves & ports without disassembly. Cleans injectors, valves, valve stems, combustion chamber & other vital parts in fouled petrol injection systems without dismantling. Restores injector spray pattern. Improves the cylinder compression ratio balance. Frees sticking exhaust valves. Restores the injection time to its original value. Restores good engine operation. Reduces CO & HC values in the exhaust gases in accordance with required standards. Safe for spark plugs & catalytic converters. Can be used on all fuel systems of petrol engines with carburettor, continuous, multipoint, mono-point, direct injection (GDI, FSI, …). Recommended treatment every 20.000 to 30.000 km or when experiencing problems of poor running, rough idling or excessive exhaust emissions