

⚙️ Keep your engine running like a pro — don’t let performance slip away!
Marvel Mystery Oil’s 1-gallon red transparent oil additive is engineered to clean and lubricate fuel injectors and carburetors, prevent varnish and gum build-up, and protect against valve sticking and oil breakdown in extreme temperatures. Compatible with a wide range of gasoline and pre-2007 diesel engines, it ensures smoother, quieter operation across automotive, marine, motorcycle, and tractor applications.






| ASIN | B00328BLNC |
| Best Sellers Rank | #211,219 in Automotive ( See Top 100 in Automotive ) #170 in Engine & Oil Fluid Additives |
| Brand | Marvel Mystery Oil |
| Customer Reviews | 4.7 4.7 out of 5 stars (229) |
| Date First Available | January 16, 2007 |
| Item Weight | 0.01 ounces |
| Item model number | MM14R |
| Manufacturer | MARVEL MYSTERY OIL |
| Manufacturer Part Number | MM14R |
| Model | Oil Additive, 1Gal, Red, Transparent |
| Product Dimensions | 15.8 x 9.56 x 11.63 inches |
S**N
This stuff is great.
First off, I am amazed at the speed of delivery. Was initially estimated to arrive between March 1-5. I got it on February 26. I tried it in my car and it seemed to run quieter, not that it was loud. When using my snowblower this year it was backfiring a couple times before it was really warmed up right. Thought I would try this in the snowblower since i had not had a new spark plug in about four years. It stopped back firing . Can't wait to try it in my 17 year old lawn mower this summer.
J**Y
There is a reason why they call it Marvel Mystery Oil, because it is!
I've even used it to soften old hard leather! It's a great lubricant that has been around for years.
1**R
Good Stuff...
My father, a master technician and engineer recommended this stuff to me many years ago. He had a dozen old toys...cars, boats, motorcycles, airplanes, etc. This is the only additive he recommended and felt that it was good for upper valve train and seats, especially on older machines. I'm using it on all my stuff. Old and new.
N**A
Old School Magic
MMO is an old-school oil and solvent that can clean and loosen many aged and abused parts. I add it to the fuel of my cars, and feel a difference, although it could be imagined... Much better price here than in local stores, so although I generally prefer to support brick and mortar, sometimes value wins out :-)
L**N
This product will help your motor
I purchased an older car that had a ticking - maybe a slight valve sticking problem. I put a small amount of Marvel Mystery Oil in the gas tank and also replaced half a quart of oil while changing oil. One day while on the expressway I changed lanes and all of a sudden this other car changed lanes too. In an effort to get out of the way I floored it. I looked in the rearview mirror and their was this cloud of smoke behind me. I mean huge dark cloud as I raced away. It was amazing, at first a litle scary then I realized my engine needed this. A good blowout. My motor is so quiet and idles so smooth that I hear the cars engine next to me in traffic but not mine. I actually thought on one occasion the engine had stopped but i blipped the gas and yes it was running. I will continue to use this product for the life of my car.
A**.
It's Marvelous
I've used it in fuel and oil for close to 50 years.
X**8
Marvel still reliable after all these years
Follow the instructions and your car will be running more efficiently! Thank you Marvel! It's cheaper to buy the gallon in the long run.
J**W
Great for everything
I have a few containers of 32oz MMO that I just refill using this. A small funnel is all you need and at the price paid, under 16 dollars, it's a total value. Used with gas (6oz for full tank, 15 gallon tank) and for cleaning additional sludge prior to oil change (remove a quart of oil oil and add quart of MMO, drive for about 300 miles). I have a 2007 Toyota Matrix that has been running smoothly since.
A**.
Ya lo habia utilizado, y si...si funciona, claro que debes hacerlo en varios cambios de aceite y saldran los resultados, si estaba humeando..lo deja de hacer asi de facil..
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