Fuel Additive (32 oz.)
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Marvel Mystery Oil Fuel Additive (32 oz.)

Part No. MM13R Warranty Details  
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 (32 oz.)
 
4.7

(based on 37 reviews)

Ratings Distribution

  • 5 Stars

     

    (30)

  • 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 (29)
  • Runs clean (27)
  • Reduces wear (24)
  • Safe (21)

Cons

No Cons

Best Uses

  • Regular use (27)
  • Car (24)
  • Truck (14)
  • RV (9)
  • Quick fix (7)
    • Reviewer Profile:
    • Casual driver (4), Mechanic (3)
    • Reviewer Profile:
    • Auto enthusiast (15), Casual driver (12), 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 37 customers

Displaying reviews 1-10

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5.0

No Mystery At All - Lifesaver For Your Vehicle!

By 

from Huntsville, AL

About Me Casual Driver

Verified Buyer

Pros

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

Cons

    Best Uses

    • Car
    • Truck

    Comments about Marvel Mystery Oil Fuel Additive (32 oz.):

    I use this product in my vehicles as well as my lawn mowers, and it keeps the life of the engine in great shape!

    Comment on this reviewHelp Icon(earn points)

     
    5.0

    Oldie but goodie

    By 

    from Fl

    About Me Auto Enthusiast

    Ask me a question

    Verified Buyer
    3 or more reviews submitted

    Pros

    • Reduces Wear
    • Runs Clean
    • Safe

    Cons

      Best Uses

      • Car
      • Regular Use
      • RV

      Comments about Marvel Mystery Oil Fuel Additive (32 oz.):

      Used for over 40 years

      Comment on this reviewHelp Icon(earn points)

       
      5.0

      Use on regular basis

      By 

      from Cleveland OH

      Verified Buyer
      3 or more reviews submitted

      Comments about Marvel Mystery Oil Fuel Additive (32 oz.):

      Use on every fill up

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      5.0

      Best Additive

      By 

      from Cleveland OH

      About Me Auto Enthusiast

      Verified Buyer
      3 or more reviews submitted

      Pros

      • Improves Vehicle Performance
      • Reduces Wear
      • Runs Clean

      Cons

        Best Uses

        • Car
        • Regular Use

        Comments about Marvel Mystery Oil Fuel Additive (32 oz.):

        Used to all three of my cars. It has improved gas mileage. It has improved car peppiness. I use it on every gas fill up. the instructions are easy to follow. I use 8 oz per nineteen gallons of gas. Since i started using my high way average mile per gallon has gone from twenty three miles per gallon to twenty eight. I even achieved on a one hundred eight mile stretch a whooping thirty three miles per gallon. I have used many of the other cleansers on the market and i can say will certainty that this product does what it says. I am a believer.

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        5.0

        marvel is marvelous

        By 

        from Corry pa

        About Me Casual Driver

        3 or more reviews submitted

        Pros

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

        Cons

          Best Uses

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

          Comments about Marvel Mystery Oil Fuel Additive (32 oz.):

          I started using this product this year ( 2016 ) and after trying other additives was shocked at how well this actually works. Its better than advertised. It fixed my sticky lifter problem in my 2002 jeep grand Cherokee limited V8 and improved performance in my 1999 ford ranger v6. this product doesn't stop working either. I added some to my oil before an oil change and when I changed the oil at a later date that oil cleaned the crud build up off my oil drain pan too. very impressed

          Comment on this reviewHelp Icon(earn points)

          (2 of 2 customers found this review helpful)

           
          5.0

          Has worked for generations.

          By 

          from Syracuse Indiana

          About Me Casual Driver, DIY

          Level 3

          Pros

          • Cheap
          • Improves Vehicle Performance
          • Old School
          • Reduces Wear
          • Runs Clean
          • Safe

          Cons

          • None

          Best Uses

          • Car
          • Drilling
          • Regular Use
          • RV
          • Tap Die
          • Truck

          Comments about Marvel Mystery Oil Fuel Additive (32 oz.):

          !! This stuff will NOT damage anything in your engine or blow up your engine!! The woman in reviews who blamed MMO on her engine blowing up MAY have had an engine with only 20 miles left on it anyway!! My dad, great uncle used MMO years ago. I started using MMO 25 years ago in an outboard with a gummed up fuel pump/crankcase and POOR running- problem solved! Used MMO since 20k miles in 1997 3.1 Chevy Lumina- now 280k miles and uses NO oil! Just use it as directed % in your gas and oil and you can expect a cleaner, longer running engine. Stihl chainsaw, outboards, snowmobile, Honda ATV, our cars and trucks, lawn mowers-EVERYTHING!! I even have a squirt can of MMO for lubing squeaks and for using when drilling metals. Use it in Master Locks and storm door latches to keep from freezing in the winter. Check out their website if you're unsure. Its cheap, contains no alcohol (Lucas does), and works on everything without fear of damage. What do you have to lose?

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          (2 of 4 customers found this review helpful)

           
          4.0

          I buy this product all the time

          By 

          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 (32 oz.):

            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!

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            (3 of 5 customers found this review helpful)

             
            5.0

            excellent

            By 

            from Housatonic, MA

            About Me Auto Enthusiast

            Helpful Reviewer

            Pros

            • Improves Vehicle Performance

            Cons

              Best Uses

              • Add To Gas Not Oil

              Comments about Marvel Mystery Oil Fuel Additive (32 oz.):

              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 reviewHelp Icon(earn points)

              (3 of 5 customers found this review helpful)

               
              5.0

              Marvel Mystery Oil

              Profile Image

              By 

              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 (32 oz.):

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

              Comment on this reviewHelp Icon(earn points)

              (2 of 11 customers found this review helpful)

               
              5.0

              This really works for me.

              By 

              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 (32 oz.):

                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.

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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. For further assistance, please review your support options on our Contact Us page.

                21 Questions | 24 Answers
                Displaying questions 1-10Previous | Next »
                • Q:

                  Will the item help stop oil leak on my 2002 Jeep Grand Cherokee Limited?
                  Asked on 7/5/2016 by Ra from Brockton, MA

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Hi Ra, glad to help you! Marvel Mystery Lubricating Oil is safe for catalytic converters and oxygen sensors. Added to gas it cleans and lubricates fuel injectors and carburetors, improves gasoline mileage, extends spark plug life, reduces and prevents varnish and gum build-up. Added to oil it prevents valve sticking and clatter, fortifies properties of engine oil, prevents breakdown caused by extreme temperatures, reduces and prevents acid and sludge formation and promotes easier cold weather starts. This diesel fuel additive does not comply with federal low sulfur content requirements for use in model 2007 and newer diesel motor vehicles. For more information, I would suggest that you contact the manufacturer directly at 1-800-Turtle Wax and they would be in a better position to help you.

                    Answered on 7/6/2016 by Steve from AAP
                • Q:

                  Does MMO remove water from fuel and is it campatable in aircraft engines?
                  Asked on 7/3/2016 by James from Hardeeville, SC

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Hi James! I have searched online, but unable to locate the specific required information with the manufacturer's listings. I would suggest that you contact the manufacturer directly at 1-800-Turtle Wax and they would be in a better position to help you.

                    Answered on 7/7/2016 by Steve from AAP
                • Q:

                  We have a strange problem and it has been recommened that we use some Marvel to help resolve it. THE PROBLEM - we start the truck up and as soon as the oil gets warm the gauge in the truck falls like a rock and the "check gauge" light comes on. Needless to say we have not gone anywhere with the truck other than in our small town. We have changed the oil pressure sender sensor but it did not resolve the problem. NOTE: when we changed the oil, the oil filter was FULL of sludge!! We are afraid that some of that sludge got into the oil lines. Can you help us with how much Marvel to use to the existing oil that is in the truck? And should we change the oil after using it, or should we just wait until the next regular(3000 miles) oil change?
                  Asked on 4/7/2016 by Ruth from Pawnee, IL

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Hi Ruth, glad to assist you! This Marvel Mystery Oil Fuel Additive (Part No. MM13R) 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. For more information, I would suggest that you contact the manufacturer directly at 1-800-Turtle Wax and they would be in a better position to help you.

                    Answered on 4/26/2016 by Steve from AAP
                • Q:

                  can this be used in my transmison
                  Asked on 3/20/2016 by tim

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Hi Tim, glad to help you! Marvel Mystery Lubricating Oil is safe for catalytic converters and oxygen sensors. Added to gas it cleans and lubricates fuel injectors and carburetors, improves gasoline mileage, extends spark plug life, reduces and prevents varnish and gum build-up. Added to oil it prevents valve sticking and clatter, fortifies properties of engine oil, prevents breakdown caused by extreme temperatures, reduces and prevents acid and sludge formation and promotes easier cold weather starts. For more information, I would suggest that you contact the manufacturer directly at 1-800-Turtle Wax and they would be in a better position to help you.

                    Answered on 3/21/2016 by Steve from AAP
                • Q:

                  How much do I add to the oil for a Honda Civic 2005?
                  Asked on 9/10/2015 by Dennis

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Hi Dennis, I'm glad to assist you. It is recommended to use 4 ounces this Marvel Mystery Oil Fuel Additive (32 oz.) (Part No. MM13R) for every 10 gallons of fuel.

                    Answered on 9/10/2015 by Solomon
                • Q:

                  Will Marvel Mystery Oil stop engine knock?
                  Asked on 9/3/2015 by Knocking & worried!

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Good question Knocking & Worried, I will be happy to help. We cannot guarantee that this product will stop your engine from knocking. This is a great product and a great place to start to try and see if it eliminates the problem. You may have something more serious going on and possibly want to seek an actual mechanic shop for further diagnostic.

                    Answered on 9/3/2015 by JJMO ASE Parts Pro from AAP
                • Q:

                  What ratio do you mix it in oil, how much marvel do I place in the engine per quart of 10w-40?
                  Asked on 5/2/2015 by Preston

                  1 answer

                  • CUSTOMER CARE

                    A:

                    I'm happy to help, Preston! Marvel Mystery Oil Fuel Additive (Part No. MM13R) will replace 1 quart of oil in a typical 5 quart oil change.

                    Answered on 5/2/2015 by Heath, ASE Parts Specialist from AAP
                • Q:

                  Can this also work to remove rust, corrosion on mildly affected parts?
                  I saw someone use it to clean rust on a video and was wondering if this would work. I have a few bolts on my motorcycle that are starting to corrode.
                  Asked on 4/16/2015 by Chuck

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Happy to help you with your question Chuck! It may be possible that this product can remove rust but I would not suggest using it like that just because it is not its intended purpose and if it may have adverse effects. If you are looking for something to remove rust I suggest Evapo-Rust Part No ER012 1 gallon, ER004 32oz, or PB Blaster 16-PB.

                    Answered on 4/18/2015 by Panda from AAP
                • Q:

                  can this product be used on a riding mower
                  Asked on 3/22/2015 by Skip

                  1 answer

                  • CUSTOMER CARE

                    A:

                    I'm happy to help, Skip! You may use Marvel Mystery Oil Fuel Additive (Part No. MM13R) an be used in your riding mower. Be sure to add the Marvel Mystery Oil at the proper ratio for your mower.

                    Answered on 3/23/2015 by Heath, ASE Parts Specialist from AAP
                • 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
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