Description
Since 1923, Marvel Mystery Oil has been trusted to help clean, lubricate, and protect internal engine components. Its versatile formula can be added to both engine oil and fuel to help reduce sludge, varnish, and gum deposits while supporting smoother engine operation and improved performance.
Compatible with conventional and synthetic oils, as well as 2-cycle and 4-cycle engines, Marvel Mystery Oil helps maintain cleaner engines, lubricates upper cylinders, and supports easier cold-weather starts. It is also safe for catalytic converters and oxygen sensors.
Product Benefits
✔ Cleans Engine Deposits
Helps reduce sludge, varnish, and gum buildup to support cleaner engine operation.
✔ Lubricates Upper Cylinders
Provides additional lubrication to help promote smoother idling and engine performance.
✔ Supports Engine Performance
Helps improve compression, engine power, and fuel economy when used as directed.
✔ Safe for Modern Engines
Compatible with conventional and synthetic oils and safe for catalytic converters and oxygen sensors.
✔ Multi-Purpose Formula
Can be added to both engine oil and fuel for cleaning, lubrication, and ongoing engine maintenance.
How to Use
Use in Engine Oil
- During your next oil change, replace approximately 20% of the engine oil with Marvel Mystery Oil.
- For example, if the engine capacity is 5 quarts, replace one quart of engine oil with one quart of Marvel Mystery Oil.
- Repeat at every oil change for continued engine maintenance.
Use in Fuel
- Add Marvel Mystery Oil to the fuel tank according to the product directions.
- Use regularly to help clean and lubricate fuel injectors and carburetors while supporting engine performance.
