Marvel Mystery oil (MMO) is effective in lubricating the entire fuel system, including fuel pumps, fuel injectors or carburetors and the top-segment of the cylinders. These are parts motor oil does not reach. Marvel Mystery Oil lengthens the life of these very important components by supplying them with lubrication that fuel alone does not offer.
Whenever an engine is turned off, a minuscule drop of fuel remains at the top of the fuel injectors or carburetor jets. This small drop of fuel solidifies into a varnish-type residue, which blocks the openings of the injectors or jets over time, leading to lower performance, poor fuel economy and shorter life of these components. Marvel Mystery oil reduces varnish and gum build-up.
Marvel Mystery oil also extends spark plug life by creating a cleaner burning cylinder environment that reduces carbon build-up on spark plugs, resulting in better firing that increases performance and durability. By reducing internal friction in the engine, Marvel Mystery oil also improves fuel mileage.
Marvel Mystery oil works best when added to the engine at every oil change. In a traditional engine with a five-quart capacity, simply replace one of the engine oil quarts with a quart of Marvel Mystery oil.