STP is an American brand and trade name for the automotive additives, lubricants and performance division of armoured auto group. STP super concentrated fuel injector cleaner contains concentrated detergents that help dissolve and remove harmful carbon, gum and varnish deposits on fuel injectors. Without cleaning, deposits can lead to hard starts, lost acceleration and rough idling. This product is made with jet fuel, a high-quality carrier of active ingredients. Only for petrol cars.