SI1 Complete Fuel System Cleaner is a concentrated package of the most powerful high-temperature detergents available to clean gasoline fuel injectors and intake valves. Complete Fuel System Cleaner can clean injectors to nearly 100% efficiency in one treatment. The cleansing effect on injector deposits can raise fuel economy approximately 12% or even greater, depending on the condition of the injectors. Although many gasolines advertise injector cleanliness, GM presented a paper to the SAE which indicates that their customers encountered injector plugging with all major brands of gasoline (SAE 861533). Complete Fuel System Cleaner contains detergents and a synthetic upper cylinder lubricant which will help clean the intake valves, pollution control valves, combustion chamber deposits and carburetors. Complete Fuel System Cleaner also protects the fuel system from rust. Safe for continual use.