Fuel Additive, 32oz.
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Marvel Mystery Oil Fuel Additive, 32oz.

Part No. MM13R Warranty  
Marvel Mystery Oil helps extend engine life by breaking down and removing harmful deposits of sludge and carbon in your engine oil. When regularly added to your fuel, it helps keep spark plugs and fuel injectors free of carbon deposits, resulting in increased fuel economy. Marvel Mystery Oil fortifies motor oil for increased resistance to high temperatures and easier cold-weather starting.
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Container/Package Size:32 oz
Container/Package Type:Plastic Bottle
Diesel Compatible:Yes
Oil Quantity Treated:5 qt
Stops Leaks:Yes
Synthetic Compatible:Yes

REVIEW SNAPSHOT®

by PowerReviews
Marvel Mystery OilFuel Additive, 32oz.
 
4.6

(based on 31 reviews)

Ratings Distribution

  • 5 Stars

     

    (24)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

97%

of respondents would recommend this to a friend.

Pros

  • Improves vehicle performance (25)
  • Runs clean (22)
  • Reduces wear (19)
  • Safe (17)

Cons

    Best Uses

    • Regular use (23)
    • Car (19)
    • Truck (11)
    • Quick fix (6)
    • RV (6)
      • Reviewer Profile:
      • Casual driver (4), Mechanic (3)
      • Reviewer Profile:
      • Auto enthusiast (13), Casual driver (9), Mechanic (4)

    Most Liked Positive Review

     

    Mystery oil is a marvel

    I first got introduced to Marvel when I got a world war I sword that had tarnish and rust on it, but was saveable. My grandfather said put Marvel Mystery in scabbard and give...Read complete review

    I first got introduced to Marvel when I got a world war I sword that had tarnish and rust on it, but was saveable. My grandfather said put Marvel Mystery in scabbard and give it a week,just change it to keep clean every other day but let blade sit in it.I did it for month and when i took blade out,I could see tatoo on blade I didn't see before because of surface rust and tarnish.Didn't hurt on value either. He and an Older friend told me that they swear by Marvel for years on their cars.Always put it in on oil changes now.First thing I do when I buy car is change oil and put marvel in.

    VS

    Most Liked Negative Review

     

    Added it to my oil

    I added this to my oil and Now I have to buy a new motor I may have driven 20 miles before my motor broke loose I ask for something that would stop my valves...Read complete review

    I added this to my oil and Now I have to buy a new motor I may have driven 20 miles before my motor broke loose I ask for something that would stop my valves from chattering until I got my oil changed I ask the service person at Auto Zone and this is what he gave me I sorry I dont think my 2007 Cobalt was ready to have a new motor this soon It did not stop the chattering and now I have to get a new motor Julie Roush

    Reviewed by 31 customers

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    Displaying reviews 1-10

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    4.0

    I buy this product all the time

    By Tractorgarden

    from Punxsutawney PA

    About Me Auto Enthusiast, Mechanic, Truck Enthusiast

    Verified Buyer
    Level 1

    Pros

    • Improves Vehicle Performance
    • Runs Clean
    • Safe

    Cons

      Best Uses

      • Car
      • Quick Fix
      • Regular Use
      • RV
      • Truck

      Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

      I use this product in all my equipment.I add to my fuel oil mix in my two cycle snowmobiles. I add it to both the fuel and oil in my gas and diesel powered engines. It seams to make the diesel run smoother,like it cleans the injection pump,and injectors.I feel it has improved the zip-and also the mileage has increased slightly on the 7.3 powerstroke. It has made my vintage garden tractors run like new...some of the old engines I had to change the oil multiple times because it kept breaking down carbon deposits.The end result is a very clean engine!

      Comment on this review(earn points)

       
      5.0

      excellent

      By IngSoc

      from Housatonic, MA

      About Me Auto Enthusiast

      Level 1

      Pros

      • Improves Vehicle Performance

      Cons

        Best Uses

        • Add To Gas Not Oil

        Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

        Added to fuel in Volvo 240. Improvement in startup and engine runs smoother. Improved gas mileage by 1.5 mpg. Usually add 3oz to 10 gallons.

        Comment on this review(earn points)

         
        5.0

        Marvel Mystery Oil

        By john

        from pittsburgh

        About Me Casual Driver

        Ask me a question

        Verified Buyer
        3 or more reviews submitted

        Pros

        • Frees Up Sticky Valves
        • Improves Vehicle Performance
        • Quiets Valves
        • Reduces Wear
        • Runs Clean
        • Safe

        Cons

        • None

        Best Uses

        • Add To Gas Each Fill-up
        • Car
        • Quick Fix
        • Regular Use
        • Truck

        Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

        Truck had loud Tapping Valve noise. used it in 2 fill-up and quieted the Valves and improve the gas mileage.

        Comment on this review(earn points)

        (0 of 1 customers found this review helpful)

         
        5.0

        This really works for me.

        By skondamuri

        from Georgia

        About Me Auto Enthusiast, Casual Driver

        Ask me a question

        Verified Buyer
        Level 3

        Pros

        • Improves Vehicle Performance
        • Reduces Wear
        • Runs Clean

        Cons

          Best Uses

          • Car
          • Regular Use

          Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

          This really works and the performance of the car is really great. I use this in both the crank case and gas tank. Engine really smoothed a lot and i have lots of miles of my car.

          Comment on this review(earn points)

          (1 of 1 customers found this review helpful)

           
          5.0

          Product works well.

          By Highway Star

          from Lilburn, GA

          About Me Auto Enthusiast

          Ask me a question

          Verified Buyer
          Level 5

          Pros

          • Improves Vehicle Performance
          • Reduces Wear
          • Runs Clean
          • Safe

          Cons

            Best Uses

            • Car
            • Regular Use
            • Truck

            Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

            I use this product at each refueling on several vehicles to help maintain fuel system components.

            Comment on this review(earn points)

            (1 of 1 customers found this review helpful)

             
            5.0

            Use as fuel additive

            By George the Greek

            from Lawrenceville, GA

            About Me Auto Enthusiast, Shadetree mechanic, Truck Enthusiast

            Ask me a question

            Verified Buyer
            3 or more reviews submitted

            Pros

            • Improves Vehicle Performance
            • Runs Clean
            • Safe

            Cons

            • None

            Best Uses

            • Car
            • Regular Use
            • RV
            • Truck

            Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

            Best as a fuel additive. I have used in my oil.It seems to work. After research Marvel Mystery Oil has few if any negative comments as an oil additive. I wildlife as a fuel additive in the future.

            Comment on this review(earn points)

             
            5.0

            Marvel mystery oil really works

            By TrickyRicky

            from Raleigh

            About Me Mechanic

            Verified Buyer

            Pros

            • Improves Vehicle Performance

            Cons

              Best Uses

                Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

                Effective on sticky lifters and valves

                Comment on this review(earn points)

                (0 of 1 customers found this review helpful)

                 
                5.0

                My TDI is running cleaner than ever.

                By 23TBucket

                from Yonkers

                Verified Buyer
                Level 2

                Pros

                • Improves Vehicle Performance
                • Runs Clean

                Cons

                  Best Uses

                    Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

                    I add Marvel at every fillup. It has solved my soot issues. My back bumper is no longer black and drivers behind me no longer get the James Bond treatment when I rev over 3,000.

                    Comment on this review(earn points)

                    (0 of 2 customers found this review helpful)

                     
                    3.0

                    Marvel Mystery Oil

                    By Big D

                    from HV, PA

                    About Me Casual Driver

                    Verified Buyer
                    Level 1

                    Pros

                    • Improves Vehicle Performance
                    • Reduces Wear
                    • Runs Clean
                    • Safe

                    Cons

                      Best Uses

                      • Car
                      • Regular Use

                      Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

                      On an individual car, there's no way to evaulate

                      Comment on this review(earn points)

                      (5 of 10 customers found this review helpful)

                       
                      5.0

                      Quality product

                      By Highway Star

                      from Lilburn, GA

                      About Me Auto Enthusiast

                      Ask me a question

                      Verified Buyer
                      Level 5

                      Pros

                      • Improves Vehicle Performance
                      • Reduces Wear
                      • Runs Clean
                      • Safe

                      Cons

                        Best Uses

                        • Car
                        • Regular Use
                        • Truck

                        Comments about Marvel Mystery Oil Fuel Additive, 32oz.:

                        I use one (1) ounce of this product with each refueling of a 2002 Toyota Camry LE and 2009 Chevy Equinox. I find that it is more cost effective than other fuel system cleaning products.

                        Comment on this review(earn points)

                        Displaying reviews 1-10

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                        Do you have questions about this product?(earn points for answers!)

                         

                        Ask a question, get answers from real customers and in-house experts. Or contact Customer Care by email or call 1-877-238-2623.

                        12 Questions | 15 Answers
                        Displaying questions 1-10Previous | Next »
                        • Q:

                          Can MMO be used in a transmission to help stop an intermittent sticking TCC solenoid?
                          Asked on 11/30/2014 by Jim from New Jersey

                          1 answer

                          • CUSTOMER CARE

                            A:

                            I'm happy to help, Jim! This Marvel Mystery Oil Fuel Additive, 32 oz. (Part No. MM13R) can be used in an automatic transmission. In the transmission, only 16 oz of MMO is recommended.

                            This product may or may not help with your sticking TCC solenoid. If you have not already, I recommend following your transmission service procedures (drain and refill or flush) outlined in your owner's manual.

                            Answered on 12/11/2014 by Heath, ASE Parts Specialist from AAP
                        • Q:

                          If my vehicle uses 6 quarts of oil, should I replace 1 quart with a 32oz bottle of Marvel Mystery Oil?
                          Asked on 11/19/2014 by charles

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Hi Charles, glad to help you! This product should be added to your engine oil at every oil change. In a traditional automobile engine with a 5 quart oil capacity, simply replace one of the engine oil quarts with a quart of Marvel. Use 4 ounces for every 10 gallons of fuel. Marvel is also safe and effective to use with synthetic and synthetic-blend motor oils.

                            Answered on 11/22/2014 by Steve from AAP
                        • Q:

                          Does MMO have a limited shelf life ? In other words, does it go bad after a period of time ?
                          Asked on 6/27/2014 by BW

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Hi BW, good question! According to the 2009 MSDS, assuming the container is tightly closed and properly stored, it has a shelf life of at least 3 years. If the container’s never been opened, and not subjected to extreme heat, the shelf life should be good for a decade.

                            Answered on 7/10/2014 by John the Car-Doc from AAP
                        • Q:

                          Does Marvel Oil help restore main oil seals which have a slight leak?
                          Asked on 11/14/2013 by Gunther from Homestead, FL

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Great question Gunther, this oil lubricates the entire fuel system-fuel pumps, fuel injectors or carburetors and the top portion of the cylinders. These are areas, that by design, motor oil does not reach. Using Marvel Mystery Oil in your fuel extends the life of these vital components by providing them with lubrication that fuel alone does not provide. It stops leaks. This diesel fuel additive does not comply with federal low sulfur content requirements for use in model 2007 and newer diesel motor vehicles.

                            Answered on 11/15/2013 by Steve from AAP
                        • Q:

                          When adding this product to the oil, how long do you keep it in before changing oil?
                          Asked on 2/27/2012 by Jim from Rockville, MD

                          1 answer

                          • CUSTOMER CARE

                            A:

                            This part Marvel Mystery Oil Fuel Additive, 32oz., Part No. MM13R manufactured by Marvel Mystery lubricates the entire fuel system-fuel pumps, fuel injectors or carburetors and the top portion of the cylinders. These are areas, that by design, motor oil does not reach. Using Marvel Mystery Oil in your fuel extends the life of these vital components by providing them with lubrication that fuel alone does not provide. When ADDED TO ENGINE OIL : Marvel should be added to your engine oil at every oil change. In a traditional automobile engine with a 5 quart oil capacity, simply replace one of the engine oil quarts with a quart of Marvel. Marvel is also safe and effective to use with synthetic and synthetic-blend motor oils.
                            When ADDED TO GAS OR DIESEL: Marvel should be used in the fuel at every fill-up. Use 4 ounces for every 10 gallons of fuel.
                            NOTE FOR DIESEL FUEL USERS - This diesel fuel additive does not comply with federal low sulfur content requirements for use in model 2007 and newer diesel motor vehicles.

                            Answered on 2/28/2012 by Aaron from AAP
                        • Q:

                          i have a 1956 dodge with a 315 super red ram, would this harm the engine?
                          Asked on 12/4/2011 by tex

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Yes, you can use this additive and it will not harm the engine.

                            Answered on 12/6/2011 by John the Car-Doc from AAP
                        • Q:

                          Will it affect the catalytic converter when added to gas?
                          Asked on 9/21/2011 by Anonymous from hamburg,ny

                          1 answer

                          • CUSTOMER CARE

                            A:

                            No, Marvel Mystery Oil has undergone rigorous testing to ensure the safety of all internal components in your vehicle including highly-sensitive oxygen sensors, fuel sensors and catalytic converters.

                            Answered on 9/22/2011 by Aaron from AAP
                        • Q:

                          can it unseize an engine
                          Asked on 7/3/2011 by bobby

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Your vehicle engine may have seized for several reasons. Marvel Mystery Oil helps extend engine life by breaking down and removing harmful deposits of sludge and carbon in your engine oil.

                            Answered on 7/6/2011 by Steve from AAP
                        • Q:

                          i have a 1998 ford f 150with a 4.6 liter 8 cylinder fuel injected engine and was wondering if this oil and gas additive would cure a tapping noise in the engine? the noise is not loud at this point .
                          Asked on 3/28/2011 by Anonymous

                          1 answer

                          • CUSTOMER CARE

                            A:

                            With out the presence of your vehicle we would not be able to properly diagnose it nor provide you with a 100% answer. We would suggest taking your vehicle to a certified mechanic for a proper diagnosis before buying and having parts installed that may not solve or be the problem.

                            Answered on 4/18/2011 by David the Dynamite Parts Guy from AAP
                        • Q:

                          If adding to oil change to 4 cly engine how much do you add
                          Asked on 10/1/2010 by jerry from Florida

                          2 answers

                          • CUSTOMER CARE

                            A:

                            Add the whole bottle, just subtract some of the oil you add to compensate.

                            Answered on 10/1/2010 by Mike from AAP
                          • A:

                            The directions says to replace 20% to 25% of your oil with marvel mystery oil in your crank case.

                            Answered on 9/8/2011 by xXJ8892 from Longwood, Fl
                        Displaying questions 1-10Previous | Next »

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