Features:

  • Kit Includes (2) 16oz. Bottles of Marvel Mystery Oil additive
  • Superior cleaning for engines and fuel systems
  • Reduces wear and tear on engines
  • Top end lubrication and sludge control
  • Helps increase gas mileage
Works. Doesn't smell bad. Better than Lucas.

Don't know if it really works but I've used up 1 gal of this stuff in my engine and as gas treatment. Ran out about 2 months ago and I did notice my gas milage went down 2-3miles to the gal. Must be working. Also been using it on engine on my last 500-1000miles. Seems to idle much quieter with it than without. I'll keep using until it quits working.

Proven

Been using Mystery oil for 40 years, we usually get over 200K in our vehicles, until the rust gets the body.

Best Price for a 2 pack and it WORKS!

I've always wondered about Marvel Mystery Oil as I've seen reviews along with various YouTube videos about the benefits of this product. So I decided to give it a try. Make sure you follow the instructions on the label for the application your using it for! It doesn't take a lot, whether adding to your oil or your gas First I put some in my gas tank at the recommended amount (4 oz per 10 gallons). Most people do this 2 to 3 times to get the full benefits of the product. So a 16 oz bottle of Marvel Mystery Oil would treat 40 gallons of gas. It has improved the performance of my 2011 KIA Sorento 4 cylinder after using on 40 gallons and I'm going to change the spark plugs now. On my significant others 2002 Toyota SR5 4runner, we've had issues with 3 of the idiot lights always staying on, which I've read could be the O2 sensors. On the 3rd application (I used a bottle, 4 oz per 10 gallons, 4 times in a row) those lights went off and have stayed off for 3 months now! Did it clean out the O2 sensors? I'm going to say yes because they have been on for a full year! Then I added some to my KIA's 4 cylinder oil. You can add or replace 20% of your oil so if you use 5 quarts of oil, you could replace 1 quart of oil with Marvel Mystery Oil. I had changed my oil around 3,000 miles ago with full synthetic Castrol Edge along with using a high dollar synthetic oil filter. This synthetic oil has been so "clean and clear" that it was difficult to read the level on the dipstick. But it was like a 1/2 quart low. So I added 10 oz directly to the motor. 200 miles later, the oil went from almost being clear to black!! So it definitely was cleaning something. I drove it 300 more miles and then changed the oil and filter. I had read that you should add this product like 500 miles before your scheduled oil change and now I see why! My KIA is purring like a kitten and I'm getting 3 more miles per gallon on the highway (78 on the interstate). Finally, I had added some (4 oz) to a 1 gallon gas container for my lawn mower and the some to the 1 gallon mixture of gas/oil for my old Toro snowblower. The snowblower had been running rough and occasionally dying on me. By the 2nd time I refilled the Toro's gas tank, that 25 year old Toro was once again running like it did when I got it new! I'm serious here! Then this Spring (right now), it naturally was added to the lawn mower. I just got done mowing the yard for the 2nd time this year and it uses 1 tank of gas to get the entire yard done. When I went to start it up, it started on the first pull as usual. But a HUGE gray smoke cloud came out of the exhaust! And it's never done that before. But it's purring like a kitten too! I'm no mechanic but am rather handy. Just installed a new capacitor on the outside air conditioner as it wasn't cooling. And it solved the issue. Marvel Mystery Oil says it improves compression, power, & MPG, along with lubricating upper cylinder for smoother idling along with keeping engines clean from sludge. Based off my results or experiences. I would have to agree 100%. I'll keep adding a little to the gas now & then. But if I add to the oil, I will only due that like 200 miles before the next oil change. I recommend trying!!!

The best stuff for my car runs very good and very ...

The best stuff for my car runs very good and very smooth. I have a 1984 corvette with 340,000 miles never done any work in the engine thanks to the marvel mistery oil 👍👏

Consider me sold.

Have no clue whats in this thing. My 05 Subaru 2.5i was drinking oil from the top mark down to the bottom mark on the dipstick and it got to the point where I would pull the dipstick completely dry. Bought car new, regular oil changes, well looked after. Issue was driving me nuts. Dropped 8oz into the engine, wasnt expecting anything whatsoever. Pulled the dipstick before the next oil change and would you believe it, it was still near the top mark!!! What the hell is this stuff!?? Is it the sweat of Gods? Car is at 170k and I will be using 2-4oz for every or every other oil change from now on.

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.

5 HP Briggs and Stratton mower in 4 years and it still runs like a top

I have ran this stuff in all my motors. I have not tuned up my 3.5 HP Briggs and Stratton mower in 4 years and it still runs like a top. I kept a gallon of fuel in the shed for 2 years treated with MMO and it ran my mower like a beast until the last drop. Unreal!

I Use It In My Fuel As A Detergent & Premix

When I have MMO in my gasoline, I am noticing a subtle difference in my engine's smoothness. The engine also tends to stammer less too and I feel confident with how silky the engine is. The vehicle is a 1994 Jeep Grand Cherokee with 200,000 miles and a 5.2L V8. One of the reason I am running it in my fuel was the need to combat deposits that were potentially causing engine knocking. Combined with premium fuel at my Sam's club, I'm happy with the results I am getting.

Used it for many years on a lot of vehicles ...

Used it for many years on a lot of vehicles. I trust this stuff in the fuel to lubricate entire fuel system. Have never had a full system problem since I began using 30 years ago.

Smooth your idle.

Crazy good oil. Lots of uses but my favorite is to smooth out idle or iinjector issues on car/truck. Add about 8oz per 20 gallons and you will see a smoother idle in most cases. Also at this ratio or upe to 16oz per 20 gallons of gas seems to really quiet down injector noise. I love it.

Full Reviews