Prolong Super Lubricants PSL16040 Fast Fuel - Injector Cleaner - 12-Ounce Bottle is expertly formulated to thoroughly clean injector tips and intake valves. It is designed to remove carbon deposit clogs that can cause both misfiring and poor fuel economy. Periodic treatment can restore an uninhibited spray pattern that allows for the optimum firing rate that is essential for smooth and efficient operation. Prolong Fuel Injector Cleaner is engineered to be compatible with all grades of gasoline.