Master Mechanic, 16 OZ, Motor Treatment, For Gasoline, Diesel, Marine, 2 & 4 Cycle Engines, Synthetic Detergent Technology Is A Complete Fuel System Cleaner That Cleans Oil Deposits In The Engine Crankcase, Dissolves Gum & Varnish In Fuel System, Removes Water, Cleans Injectors & Carburetor & Helps Improve Fuel Economy.