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Marvel MM13R Mystery Oil - 32 oz.

4.7 4.7 out of 5 stars 1,172 ratings

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Purchase options and add-ons

Brand 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
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Top Brand: Marvel Mystery Oil

Highly Rated
4.6/5 star rating from 100K+ customer ratings
Trending
100K+ orders for this brand in past 3 months
Low Returns
Customers usually keep items from this brand

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
1,172 global ratings

Customers say

Customers like the performance, value, smoothness, quality and cleaning of the auto oil. They mention that it does its job well, it's well worth having and that it helps keep the spark plugs and valves clean. They appreciate the effect on gas, and power. That said, opinions are mixed on noise.

AI-generated from the text of customer reviews

71 customers mention63 positive8 negative

Customers like the performance of the auto oil. They mention that it does its job well, their car runs very good, and they have never had any issues. They also say that it works great for freeing old stuck engines.

"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!!..." Read more

"Great Product, WORKS !!" Read more

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

"I added 1 tbsp into my weed wacker 30 seconds later it works perfect, I thought the carburetor was bad...." Read more

41 customers mention38 positive3 negative

Customers appreciate the value of the auto oil. They mention it's a good price, has quality, and is worth having.

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

"Love it. Well worth having" 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

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

28 customers mention24 positive4 negative

Customers like the smoothness of the auto oil. They say that it provides a smoother ride and the car is running smoother than before. Some mention that it improves off-idle acceleration. Overall, customers are satisfied with the product's smoothness.

"...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

"...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 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 are satisfied with the quality of the auto oil. They mention that it is excellent stuff for freeing up stuck mechanical parts like engines, and is a very good product. They also say that it's reliable and a great multi-use product.

"Good stuff" Read more

"...Overall for the price and google searches it is a very good product depending on how you use it. In gas tank or in the crank case." Read more

"This stuff is great. I was having trouble getting my lawn mower to stay running and when it did it was not running smooth...." Read more

"This stuff is great!!! Use it in your transmission. crankcase, fuel tank and use it to mix gas/ oil in 2 cycle engine...." Read more

20 customers mention20 positive0 negative

Customers like the cleaning capabilities of the auto oil. They say it's good at cleaning stuff out, helps keep the spark plugs and valves clean, and keeps the sludge to a minimum. Some customers also say that it' s a great maintenance fluid for their engine.

"...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

"...Cleans the crud and deposits from fuel and lubricating systems. Great in iron head Harleys." Read more

12 customers mention12 positive0 negative

Customers like the effect on gas of the auto oil. They say it is a great gas and oil additive, it rejuvenates gasoline, and it is the best fuel treatment they have ever used. It is good for both an oil additive and fuel additive, and works wonders to increase the octane number of gasoline. Overall, customers are happy with the product's effectiveness in all gas and engine applications.

"...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

"...I have also, noticed a better result in gas. I have older vehicles too, 1994 and 1999. It just seems to work better in gas as opposed to oil...." Read more

"...This is the key as it helps to effectively mix it into the fuel as opposed to just sitting there." Read more

"The best gas and oil additive that I've ever used for gasoline engines...." Read more

9 customers mention9 positive0 negative

Customers are satisfied with the power of the auto oil. They mention that it increases fuel and performance, and prevents engine deterioration and further corrosion. Customers also say that it works well and extends the life of their oil.

"...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

"...which in return makes you car run a lot better and gives you some better fuel economy...." Read more

"...The engine also tends to stammer less too and I feel confident with how silky the engine is...." Read more

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

11 customers mention5 positive6 negative

Customers have mixed opinions about the noise of the oil. Some mention that it quiets the clattering lifters, while others say that the ticking was loud and obvious. Some customers also say that their engine runs and sounds so much better.

"...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

"...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

"...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

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