Lucas Marine Fuel Treatment is designed specifically to address the issues watercraft owners experience with their engines and fuel systems. Fuel formula fights corrosion and keeps fuel lines, carburetors, and fuel injectors clean and free of deposits while lubricating and protecting vital engine parts. Powerful detergents, including polyether amines, improve cleanliness in the fuel system and internal engine parts. It's designed for gasoline and diesel engines, 4-stroke or 2-stroke. Upper cylinder lubricants ensure smooth operation and longer engine life. Add approximately 3 fluid ounces for every 10 gallons of fuel before or after fueling.