STP Petrol Injector Cleaner 200 ml, to unclog dirt injectors Unclogs: The petrol cleaner clears dirty injectors with just one treatment Restores Performance: Helps remove harmful deposits to restore power and acceleration Lowers Emissions: This fuel injector cleaner helps reduce fuel consumption and lower exhaust emissions Reduces Rough Idling: For a smoother engine experience Quick & Easy: Simply add this injector cleaner to your tank every 3000 miles For All Petrol Engines: Suitable for all classic/modern engines.