Fix & maintain it with Gumout. Performance additives. Restores fuel economy. Reduces emissions. Use every 3,000 miles, treats up to 21 gallons (60 l) of gasoline. Helps clean & protect your fuel system. Intake valves. Combustion chamber. Fuel injectors. Restores like new performance. Cleans fuel injectors, intake valves and ports. Keeps combustion chamber clean. Prevents future deposit build up. Works in standard, capless & obstructed gas tanks. Pour, twist & remove.