4 OZ Mechanic In A Bottle, Cleans Engines With Issues Related To Varnished Carburetors, Water In The Tank, Carbon Deposits, Ethanol, & Old/Poor Quality Gas, Removes All Varnish In The Fuel System Without Having To Remove The Carburetor From The Machine, Contains Rubber & Plastic Conditioners, Revitalizes Old Fuel, Safely Dissolves Varnish/Shellac, Anti-Corrosive/Metal Deactivator, Carbon Cleaner, Octane Improvement, Fuel Stabilization, High Temperature Detergent, Upper Cylinder Lubricity, Not A Replacement For 2 Cycle Oil.