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Non-returnable due to hazmat safety reasons
This item is non-returnable due to its composition that makes it regulated for transportation, but if the item arrives damaged or defective, you may request a refund or replacement.
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We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
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Marvel MM13R Mystery Oil - 32 oz.

4.7 4.7 out of 5 stars 1,184 ratings
$17.44
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Purchase options and add-ons

Brand Marvel Mystery Oil
Manufacturer Marvel Mystery Oil
Liquid Volume
32 Fluid Ounces
Package Information
Bottle

About this item

  • Helps improve fuel economy
  • Cleans and lubricates fuel injectors and carburetors
  • Reduces and prevents varnish and gum build-up
  • Prevents valve sticking and clatter
› See more product details

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From the manufacturer

MMO
MMO

About Marvel Mystery Oil

Born in Chicago in 1923, Marvel Mystery Oil was developed to combat deposits on carburetors caused by poorly refined gasoline of the age. Marvels popularity soared as word spread of its effectiveness in treating all types of engine ailments and was used extensively in WWII on everything from airplanes to battleships to tanks. Today, Marvel Mystery Oil provides vehicle owners the ability to solve scores of automotive ailments with one product that can be added to both oil and fuel

  • Improves Compression, Power & MPG
  • Lubricates Upper Cylinder for Smoother Idling
  • Keeps Engine Clean from Sludge
MMO

Added to Engine Oil:

At your next oil change, replace 20% of your engine oil (traditional or synthetic) with Marvel Mystery Oil. For example, if your engine has a 5-quart oil capacity, replace one of the quarts with a quart of Marvel Mystery Oil. Repeat at every oil change for optimal performance.

USE IN: Conventional, Synthetic, 2 & 4 Cycle Oil.

MMO

MMO

MMO

New to the Marvel Family:

Marvel Ultimate Fuel & Motor Treatment can be used in all engines including direct injection (GDI) and hybrids. Marvel Ultimate is also ideal for high mileage vehicles and for preventative maintenance. Marvel Ultimate should be added to fuel or used in the crankcase in oil; specially formulated even for use in synthetic oil and with most advanced fuels including top tier, ethanol blends, and biodiesels

MMO

Product Description

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.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Marvel MM13R Mystery Oil - 32 oz.

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
1,184 global ratings

Customers say

Customers like the quality, performance, value, idle and sludge of the auto oil. For example, they mention it's magic, does its job well, provides a smoother ride and that it cleans up dirty engines.

AI-generated from the text of customer reviews

61 customers mention61 positive0 negative

Customers are satisfied with the quality of the auto oil. For example, they mention it's a great gas and oil additive, and works well as an oil additive and fuel additive. Some say it'll improve engine performance and is one of the best top cylinder lubricants.

"Good stuff" Read more

"Great Product, WORKS !!" Read more

"...have used Marvel before than you know it really does help in ALL gas and oil applications. The price is ok if you are a prime member...." Read more

"...It also did the same for my civic and 4wheeler. This stuff is magic!..." Read more

54 customers mention47 positive7 negative

Customers like the performance of the auto oil. They say it does its job well, is effective, and runs very good. Some say it's good in just about everything and works great for freeing old stuck engines.

"Using this product for many years, works great in oil or gas." Read more

"...Like I said, the engine runs relatively well and I've been pleased, but I'm not certain of the benefits, if any, at this point...." Read more

"Great Product, WORKS !!" Read more

"...Next thing, it started up immediately and has been working better than ever since." Read more

42 customers mention39 positive3 negative

Customers appreciate the value of the auto oil. They say it's an excellent value for the money, it'll add to a tune-up, and it'd be well worth having.

"I have been using MMM for over 40 years. This was the best price I have found." Read more

"...The price is ok if you are a prime member. It is the same price at Walmart however for this size currently...." Read more

"Love it. Well worth having" Read more

"...As a hobbyist the uses are endless. Great deal for the money" Read more

24 customers mention18 positive6 negative

Customers like the idle of the auto oil. They say it provides a smoother ride, makes their truck run smooth, and lubricates the fuel system for smoother idling. Some mention that it cleans up dirty engines and smoothes out lumpy idles.

"...tank didnt use much and i have to say i did notice my car idling smooth considerably better then before i also had just started using that tracker..." Read more

"...Not only does my mdx idle smoother, but it also has more power and a noticeable mpg increase. My car was measured at 13.4 mpg with Premium gas...." Read more

"...I did notice the performance drop. The acceleration was definitely slower...." Read more

"...I prefer Marvel over Engine Flush as it is gentler and I dont have to worry about too much sludge being released at once possibly clogging up the..." Read more

22 customers mention22 positive0 negative

Customers like the sludge. They mention that it cleans up dirty engines, removes crud and deposits from fuel and lubricating systems, and works for engine cleaning and exhaust. Some say that it's a great product for polishing aluminum and keeping the dregs to a minimum.

"...a year now and I can feel the difference in my car and it keep my engine clean of debris." Read more

"...done using Mystery Oil, although I am impressed with it's ability to clean out my engine. Actually quite pleased with the results, increased a star!" Read more

"...Usually after 3 treatments they have a nice clean camshaft and no sludge...." Read more

"...MMO is an excellent way to keep the upper cylinder lubed and the fuel system clean...." Read more

16 customers mention14 positive2 negative

Customers like the condition of the auto oil. They say it's a quality, reliable, and durable product. Some say that it prevents the engine from deteriorating and further corrosion.

"Excellent product! Nothing worked in trying to start my snow blower this year until Marvel Mystery oil was recommended...." Read more

"...in my 2008 Jeep Cherokee with 122,000 miles for 5 years and never had any issues...." Read more

"...way or form, but it could very well be working and preventing the engine from deteriorating and further corrosion." Read more

"...Great high quality and durable oil." Read more

7 customers mention5 positive2 negative

Customers like the smell of the auto oil. They mention that it smells good and that their car stopped releasing white exhaust fumes after two weeks.

"...I would say within two weeks the car started to not release the white exhaust fumes, I am scheduled to revisit my mechanic for service and I'll let..." Read more

"...and overall good lubricant and penetrant; and it has a good sort of minty smell to it...." Read more

"...And it does not smell like mint to me. It smells more like RAID wasp spray. (Not that anyone should smell / inhale this stuff.)..." Read more

"...Smells just like you remember." Read more

12 customers mention5 positive7 negative

Customers are mixed about the noise the oil makes. Some mention that the valve train is quiet and the engine runs and sounds better, while others say that the ticking was loud and obvious, and the oil lifters chatter on start up.

"...It had developed this valve ticking on startup that would last about 10 minutes. I run only Mobil 1 synthetic oil at 5K change intervals...." Read more

"...During the week stays quiet at start. If it sits for the weekend or a few days during the week it will clack a little on startup like it’s old self...." Read more

"...A year or so later it developed an occasional tapping noise that would come and go randomly...." Read more

"...Lifters are quiet and only getting better every day. I added the 12 oz to the fuel to help with my fuel injectors...." Read more

Works great! Cleaned the injectors nicely!
5 Stars
Works great! Cleaned the injectors nicely!
Old car. High mileage. Crappy mpg. Added marvel mystery oil, a lot better. 15mpg to 21 mpg the second tank. The picture is the third tank. Worth the money for cleaning out old cars!Going to try it in the oil next.1994 cutlass supreme with 86000miles. Yeah, we drove a lot... project car.
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Top reviews from the United States

Kevin Kurtz
5.0 out of 5 stars Fast delivery
Reviewed in the United States on January 16, 2024
Verified Purchase
Good stuff
Helpful
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Tom L.
5.0 out of 5 stars Favorite
Reviewed in the United States on April 3, 2024
Verified Purchase
Using this product for many years, works great in oil or gas.
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Jake the Snake
5.0 out of 5 stars Good product Good Price
Reviewed in the United States on December 21, 2023
Verified Purchase
I have been using MMM for over 40 years. This was the best price I have found.
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Kashdoll
5.0 out of 5 stars Great
Reviewed in the United States on March 22, 2024
Verified Purchase
I have been using MMO for a year now and I can feel the difference in my car and it keep my engine clean of debris.
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Family 1st Tech
4.0 out of 5 stars Can't see any proof in the pudding...yet
Reviewed in the United States on April 5, 2016
Verified Purchase
I want to believe that something is going on in the background, but I have yet to actually feel or see any differences. It has been about a month since my oil change and introducing this into my engine. I'm giving the product 3 stars as it hasn't had any adverse reactions, but I can't quantify yet any positives from adding it in. I'll do it again for the next oil change but that may be the last before I switch back to Lucas. My vehicle is a 2001 Mitsubishi Galant with 212k miles. Like I said, the engine runs relatively well and I've been pleased, but I'm not certain of the benefits, if any, at this point. Actually, the more I think about it, I have experienced a bit of a rougher idle and some slippage upon acceleration. I can't say if that is a result of the oil being thinned out by this fluid, or if it has cleaned it up so much that I'm now feeling it. I have not, however, used this in my gas tank. I have been using Lucas religiously at this point for the last 2 years. I doubt there will be much advantage from a gas additive at this point, but I will may try it.

Overall, I suppose it may have some great properties when used as a fuel additive. I can't speak to any benefits when adding it to your oil (yet). I will use it in the next oil change and see if there are any improvements. I'll follow-up with an update after I have done that.

*UPDATE* 6/8/16
So, I am in need of another oil change and I have noticed some drastic changes since I first put this in. It's very clear to me that this product cleaned out some gunk in my engine. The results were not what I was expecting, instead of smoothing out my idle (which I think there has been some improvement there), it now burns off more oil. I am contributing that to the fact that it simply exposed the flaws in my seals. I don't mean this from a negative, destructive way, rather it cleaned it up so much that my failing seals are now actually failing instead of being gummed up. I now have some decisions to make as to how I'm going to fix the issue (some other fluid most likely). Until then, I believe I a done using Mystery Oil, although I am impressed with it's ability to clean out my engine. Actually quite pleased with the results, increased a star!
15 people found this helpful
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Dave
5.0 out of 5 stars What I wanted
Reviewed in the United States on March 6, 2024
Verified Purchase
My gunsmith guy said this is what he uses on oiling guns and that was good enough for me. I'm sure it has more purposes than that.
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Dave McC
5.0 out of 5 stars Simple put... it's Marvelous!
Reviewed in the United States on August 7, 2023
Verified Purchase
Lol. This stuff is like a miracle cure for everything!! Pretty sure carpet baggers sold it for an constipation cure in the old Wild West days!!
Just kidding, however you can free up rusty bolts, add to fuel tank as additive, clean gunk off hands or anything really! I used it in my power steering unit on my boat instead of the highly priced alternative!
8 people found this helpful
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Orochimaru Sama
5.0 out of 5 stars ok ok
Reviewed in the United States on January 9, 2014
Verified Purchase
Now my car is a 2008 dodge charger 105k miles the engine light came on at 101k miles and my warranty expired at 100k (-_-) Go figure right? lol so i have a Evap seal leak and after paying Aamco 645+130 for a smoke test and having to return 3 times for the same problem they told me were not gonna fix it because "now the problem is in your EGR valve and not the Gasket where we fixed it" come to find out there were holes in my gas tank and the work they did was BS......so being broke i needed something to hold me over so i looked on youtube after seeing good reviews on here and i saw alot of good things.i tried it in my oil and in my gas tank didnt use much and i have to say i did notice my car idling smooth considerably better then before i also had just started using that tracker system crap on USAA.com and it monitors your milage per galon and idling and so forth and the idling went up 1 notch.Id urge you to give it a try i plan on buying another when i get a oil change and get the evap seal leak fixed

UPDATE** Went to firestone they said they noticed my egr was new and suggested that i get a fuel cleaning (It was installed a year ago* i told them no thanks then 3 weeks later my egr valve code popped up (Too much of a coincidence) .Frustrated i turned to Marvel Mystery Oil again in the gas tank close to needing a fill up and the code went away after a few days.

UPDATE** Once again my car tripped a Egr code P0404 9-20-15. Not remembering what the last code that tripped before i used MM i got irritated thinking id have to take it to a shop and spend a couple hundred bucks BUT I Turned to Marvel again before needing a fill up and drove the car a week and the code reset its self so im guessing again my egr got cluttered with carbon deposit and the marvel burnt it away.This stuff is really amazing (-_-)
30 people found this helpful
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Top reviews from other countries

Sebastian Czigler
5.0 out of 5 stars Massive imrpovements
Reviewed in Canada on September 7, 2023
Verified Purchase
Noticed a massive improvement in mileage gain and engine performance within 10km of use. Its one of the few products I will review and it will have me ordering more
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Leedmar68
4.0 out of 5 stars Great water dispersant
Reviewed in the United Kingdom on August 28, 2021
Verified Purchase
I brought this for washing out a old fuel tank , also designed for a upper cylinder lubricant
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Jim Woodruff
5.0 out of 5 stars Value for the price
Reviewed in Canada on November 13, 2020
Verified Purchase
Won’t know for quite a while. Depends on how long my generator and snowmobile last compared to others.
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Mary J
5.0 out of 5 stars Amazing Stuff!
Reviewed in Canada on October 17, 2018
Verified Purchase
Use this with amazing results in everything I own with a motor.
Use as directed and you will see!
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Amazon Customer
4.0 out of 5 stars Good product
Reviewed in Canada on July 9, 2018
Verified Purchase
Works well for rust removal on chrome
3 people found this helpful
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