STA-BIL Diesel Power Boost is a combination diesel fuel conditioner and lubricity agent designed as a year-around additive for the fuel system of diesel cars, light trucks, tractors, and marine engines. Contains cetane improver for easier starts and lubricity additives for low sulphur fuel. 20 oz. bottle cleans and treats up to 150 gallons. The maximum cetane boost available Boosts cetane up to 7 numbers Improves fuel economy Improves available power Cleans and lubricates entire fuel system Safe for all diesel engines.