Super Concentrated Fuel Injector Cleaner will unclog dirty fuel injectors. STP helps engines run better. The advanced cleaning technology saves gas and lowers emissions by cleaning dirty fuel injectors. It also helps to restore power and acceleration. Pour contents into gas tank before or after fueling. Safe to use in any gasoline engine. One bottle treats up to 21 gallons of gasoline. STP Super Concentrated Fuel Injector Cleaner. Contains concentrated detergents. Helps dissolve and remove harmful carbon, gum and varnish deposits on fuel injectors. STP fuel cleaner is made with jet fuel. Improves the performance of your car