Treats one tank up to 25 gallons. Tune-up in a bottle. The complete fuel treatment. Gasoline or diesel. Use every fill up for maximum power & fuel economy. Eliminates need for higher octane fuel. Safe for any engine. Capless compatible. Counteracts negative effects of reformulated gasoline. Fouled Injectors Can Cause: 1. Loss of fuel economy. 2. Loss of power. 3. Burned pistons. 4. Premature overhauls. Cleans and lubricates carburetors, injectors and valve seats. Lubricates rings for longer cylinder life. Non-solvent. Excellent for use in marine applications. LucasOil.com. Carbon in the Combustion Chamber Can Cause: 1. Pre-ignition (pinging). 2. Loss of power. 3. Burned valves. 4. Broken rings. Burns thoroughly for more MPG and fewer emissions. Environmentally friendly. This diesel fuel additive complies with the federal low sulfur content requirements for use in diesel motor vehicles and nonroad engines. Made in USA.