Marvel Mystery Oil is a versatile oil additive and fuel treatment that delivers ultimate engine protection. Added to gas, it cleans and lubricates fuel injectors and carburetors while improving fuel economy. Added to oil, it prevents valve sticking and clatter, fortifies engine oil properties, and promotes easier cold-weather starts.

• Cleans and lubricates entire fuel system
• Reduces and prevents varnish and gum build-up
• Improves motor oil performance
• Extends spark plug life
• Prevents acid and sludge formation
• Compatible with gasoline, diesel, and biodiesel engines
• Recommended: 1 qt to 5 qt of oil, 4 oz to 10 gal of fuel
• 32 oz bottle