Castrol 215296 Fuel Stabilizer - Keeps Fuel Fresh For Up To 2 Years - Case of 6

Of Castrol Fuel Stabilizer for every 2.5 gallons of fuel. You can treat up to 25 gallons with this advanced alcohol-free formula. DIRECTIONS: Pour the entire contents of one bottle into a nearly empty tank and refuel up to 12 gallons of gasoline.