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Size:20 oz.(Pack of 2) Â Â Royal PurpleÂ 11722 Fuel Additive, Fuel System Cleaner and Stabilizer, 20 oz., Pack of 2.Â Â Royal Purple’s new Max Clean is a state of the art high performance synthetic fuel system cleaner that maximizes the performance of your fuel system. Max Clean restores lost fuel economy and deeply penetrates and cleans injectors, carburetors, intake valves, and combustion chambers. Royal Purple’s Max Clean is EPA/CARB Compliant, safe for use in gasoline and diesel engines, and can be used with all ethanol blends or biofuels. The cleaner can also be used in both 4-cycle and 2-cycle engines and will not harm vehicle emissions equipment. One can treats 15 to 20 gallons.Features:* In fleet tests fuel economy improved an average of 3.2 percent* In fleet tests horsepower increased an average of 2.6 percent* Reduces hydrocarbon, NOx and CO emissions* Helps prevent rough idle, hesitation, and stalling* Helps prevent premature spark plug fouling* Helps reduce deposit related engine knocking and pinging