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 28 reviews)

Ratings Distribution

  • 5 Stars

     

    (22)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

96%

of respondents would recommend this to a friend.

Pros

  • Improves vehicle performance (22)
  • Runs clean (20)
  • Reduces wear (18)
  • Safe (15)

Cons

    Best Uses

    • Regular use (21)
    • Car (17)
    • Truck (9)
    • RV (5)
    • Quick fix (4)
      • Reviewer Profile:
      • Casual driver (4), Mechanic (3)
      • Reviewer Profile:
      • Auto enthusiast (11), Casual driver (8), Mechanic (3)

    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 28 customers

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    Displaying reviews 1-10

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    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)

       
      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)

         
        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)

             
            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)

                    (5 of 10 customers found this review helpful)

                     
                    4.0

                    MMO

                    By Volvo 240

                    from Housatonic, MA

                    About Me Auto Enthusiast

                    Ask me a question

                    Verified Buyer
                    Level 3

                    Pros

                    • Improves Vehicle Performance
                    • Reduces Wear

                    Cons

                      Best Uses

                      • Regular Use

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

                      Use MMO as a gas additive after Volvo mechanic determined in-tank fuel pump needs to be replaced. Volvo would take four seconds to start. Poured 32oz MMO in full tank of gas and let car sit overnight. In the morning car started in two seconds, which is still not perfect, but better. Gas mileage improves 1.5 mpg. Now I use 32oz once a month. Using MMO for last six months.

                      FYI, I only use OEM parts, full synthetic oil, Mann oil filter 950/4.

                      Comment on this review(earn points)

                      (5 of 10 customers found this review helpful)

                       
                      5.0

                      Marvel Mystery Oil

                      By Rasputin

                      from Mifflintown, PA

                      About Me Auto Enthusiast

                      Verified Buyer
                      Helpful Reviewer

                      Pros

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

                      Cons

                        Best Uses

                        • Car
                        • Regular Use

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

                        Excellent product for vehicle longevity by lubricating the upper cylinders when added to gas.

                        Comment on this review(earn points)

                        (6 of 12 customers found this review helpful)

                         
                        5.0

                        can't beat this

                        By Chris weather guy

                        from Christiana,TN

                        About Me Auto Enthusiast, Mechanic

                        Verified Buyer
                        Level 2

                        Pros

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

                        Cons

                          Best Uses

                          • Car
                          • Regular Use
                          • RV
                          • Truck

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

                          I have used for years, really works

                          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.

                          10 Questions | 13 Answers
                          Displaying questions 1-10
                          • 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
                          • Q:

                            How much should I put into the engine oil?
                            and How much should I put into fuel(16-gallons tank)?

                            Thanks a lot!
                            Asked on 9/9/2010 by Anonymous

                            3 answers

                            • CUSTOMER CARE

                              A:

                              Usually you add one bottle to each. One in the oil and one in the tank.

                              Answered on 9/9/2010 by Mike from AAP
                            • A:

                              Marvel says to add 4 oz. per 10 gallons of fuel. In your case that would mean you should add appoximately 6 oz. for a full tank of fuel.

                              Don't listen to Mike from AAP telling you to add a whole 32 oz. bottle.

                              Answered on 11/12/2011 by Bubba from Earth
                            • A:

                              WOW I cannot believe "Mike from AAP" would answer that!!!!
                              The other answer is correct and what is ON THE LABEL! 4oz per 10 gallons. An entire bottle would mean 80 gallons?!?!?!!???!

                              If you try the 4oz/gal and MPG decreases, try 2-3oz/gallon instead.

                              Answered on 3/28/2012 by J from PA
                          • Q:

                            can this be used in lawn tractors and if so what amount per gallon?
                            Asked on 4/15/2010 by Anonymous

                            1 answer

                            • A:

                              yes for lawn mowers/tractors/weed eaters about one(1)oz per galon(for weed eaters use one oz less weed eater oil)

                              Answered on 6/10/2010 by j6729 from alvin tx.
                          Displaying questions 1-10

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