Marvel Mystery Oil

Marvel Mystery Oil - Oil Enhancer and Fuel Treatment, 1 Gallon

$20.47
(4.55) 4.55 stars out of 11 reviews 11 reviews
$20.47
$20.47
Free overnigh delivery
FSA and HSA eligible
Marvel Mystery Oil - Oil Enhancer and Fuel Treatment, 1 Gallon

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Customer reviews & ratings

4.55 out of 5stars
(11 reviews)
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Most helpful positive review

5.00 out of 5 stars review
Verified Purchaser
04/30/2014
Awesome product
Marvel Mystery Oil is as useful now as when it was originally introduced. This fuel/oil treatment is as good as it gets. It improves my gas mileage while drastically reducing the wear on my engine components. With a better seal during combustion not only do I have more power and greater mileage, my oil changes are less frequent as I have less particulates in the oil. I have never had any gas treatment work as well as this one.
Larrytaxi

Most helpful negative review

1.00 out of 5 stars review
Verified Purchaser
11/17/2020
Good product and timely delivery bad packaging job
Merchandise was packed in a flimsy box. Product broke open and made a mess on my doorstep. Bad job by you!
Kenneth
  • 4.00 out of 5 stars review
    Verified Purchaser
    01/27/2022
    Worth the money
    I've used it for years. Adding to diesel fuel for cleaning and lubrication (semi). Adds a notch to fuel milage, just enough to pay for itself. One Gal to oil change 500-1000 miles before oil change to clean the engine. The only issue I have with it is the bottles crack too often, and leak. This stuff smells like medicine and it's quite annoying if it leaks in the trunk, so I always transport it in the 5-Gal tough box. Due to its nature, it evaporates fairly quickly, but still. It had this problem as long as I can remember.
    LilysGarden
  • 5.00 out of 5 stars review
    Verified Purchaser
    05/14/2021
    Marvel Mystery oil fuel treatment
    I have been using marvel mystery oil since I was a little kid. I'm 65 now and trust this product 100%. I use a ounce or so in my fuel and it keeps the carbon off the piston and valves. It works super, and does a better job than anything else I've seen in comparison!! You can use it in your oil as well and keeps your engine clean.
    UncleOzzy
  • 1.00 out of 5 stars review
    Verified Purchaser
    11/17/2020
    Good product and timely delivery bad packaging job
    Merchandise was packed in a flimsy box. Product broke open and made a mess on my doorstep. Bad job by you!
    Kenneth
  • 5.00 out of 5 stars review
    Verified Purchaser
    03/17/2017
    Marvel Mystery Oil one gallon
    This item has been dis-continued at our local store. Some auto parts stores have this size in stock but their price is much higher than Wal Mart. I found that I can get this from Wal Mart online with free shipping which is worth the time and effort!
    oldTexan
  • 5.00 out of 5 stars review
    Verified Purchaser
    11/20/2016
    Cleans out the gunk
    I've been using this for years, it keeps your engine clean inside, no nasty build up that eventually causes a failure.. If you haven't used it before, you will notice this at the first oil change, it will be darker than usual as it goes to work dissolving the existing build up.
    MichaelM
  • 5.00 out of 5 stars review
    Verified Purchaser
    11/19/2016
    Great produce
    I used this product for many years. I put InThe oil and the gas because it has proven to me that it makes my equipment last for many years. We have a lot of property and a lot of equipment to take care of an a lot of hours of use. MMO has kept them working all these years
    runa
  • 5.00 out of 5 stars review
    Verified Purchaser
    10/27/2016
    marvel oil
    As time goes on it gets very challenging to locate a product and still purchase it at a reasonable cost. WalMart has this on all scores And the product, Marvel Mystery Oil, sells itself, just ask any old-timer around you Thank you WM. The ordering and store pick up option went very well and. convenient I can realize doing a lot more purchasing of products from you.
    BillB
  • 5.00 out of 5 stars review
    Verified Purchaser
    10/17/2014
    Marvel Mystery Oil Good for your car
    My first supervisor was a mechanical engineer who rebuilt and drove a ventage car as a hobby. Back in the days when cars had carberators it was the best carb cleaner I knew of. He was a big fan of MMO and I have been ever since. If you drive an older car it is a good investment and will keep you fuel pump lubricated. The fuel pump which is located in the gas tank commonly fails due to lack of lubrication due to low fuel levels. I add 4-6 oz each time I gas up my car and buying it in gallon save you about 25% over quart bottles.
    noniclname
  • 5.00 out of 5 stars review
    Verified Purchaser
    10/12/2014
    Excellent product, well priced.
    I drive a 4x4 pick-up. I use this product every time I get gas, at every oil change, put some in when I change transmission fluid/filter, and put some in when I drain/fill transfer case, and front, rear differentials. Doing the math, it's a little cheaper to buy 1 gallon as opposed to 4 quarts. I buy it on Wal-Mart.com, because I can never find it in stock.
    1mysteryoiluser
  • 5.00 out of 5 stars review
    Verified Purchaser
    05/29/2014
    Preventive Maintenence
    I have been using Marvel Mystery oil for years in my garden tractor, tiller, pressure washer, weed wacker and I add it to the fuel every time there is no better product it does exactly what it says. I have found that Walmart is the best price for 1 gallon and no one has is at a better price.
    1hobbyist
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