All engines develop performance issues over time, whether they're gas, diesel or ethanol. Carbon deposits reduce performance and fuel economy. Water and ethanol corrode key engine parts. Gumout Multi-System Tune-Up is the most advanced treatment for all types of engines, from cars to lawn mowers. It cleans and conditions using premium ingredients, like P.E.A. (polyetheramine), to help maximize performance, fuel economy and engine life. Multi-System Tune-Up can be added in the gas tank, the crankcase or via induction.The Gumout Multi-System Tune-Up Additive is great for use in gas, ethanol, diesel and oil. Just add this fuel additive to the gas tank, the crankcase or via induction. Safe for use in turbocharged and supercharged vehicles, it will not void OEM/manufacturer's warranty. Add the entire bottle of fuel tune-up to a nearly empty gasoline tank at time of oil change, then refill tank with 18 to 35 gal. of gasoline. Do not refill tank until near empty. Repeat every 3,000 miles at time of oil change. For small engines, add to gasoline using 3/4 to 1 oz. per gal. of fuel. For small 2-cycle engines, add 2-cycle oil as recommended by the engine manufacturer.