Mag 1, 12 OZ, Concentrated Fuel Injection Cleaner, Formulated With Jet Fuel, Concentrated Formula Cleans Injectors & Intake Valves, Reduces Friction, Use Every 2500 Miles, Outstanding Cleaning Power, Fights Power Loss & Restores Performance, Smooth's Rough Idle & Improves Drivability, Protects Against Valve Stem & Seat Wear At Intake Valves,1 Bottle Will Treat Up To 21 Gallons Of Fuel.