The Marvel Quart Mystery Oil is a superior cleaning oil designed to help fuel systems and engines run more efficiently. It helps to reduce engine wear and tear, extend the life and peak performance of your engine and prevent the start of cold weather. This oil is perfect for automobile, gasoline and Pre-2007 Diesel Motors, Marine, Motorcycle, Tractor and Small Engines. It has a freezing point of -60 °F, making it ideal for cold weather conditions. This oil is the perfect choice for keeping your engine running smoothly and efficiently. FleetPride is your First Click in Heavy Duty®.