It is designed to economically HELP increase the Octane number of unleaded gasoline, and provides outstanding carburetor, fuel injector, and intake valve detergency. It is safe for use in all vehicles, including those equiped with catalytic converters and oxygen sensors. Typical gas octane is raised 1.5 numbers, and the detergency level meets the requirements for BMW unlimited mileage approval. This product is not only effective octane booster, but extensive testing has demonstrated its ability to help reduce NOx Emissions and to control valve seat recession.