Marvel Mystery Oil. Is It Safe To Use In Modern Cars?

I've been using MMO since 1987, I'm not getting paid to say anything nice about it, I'm just a guy who's literally lived the last 30+ years working on cars and I've found this inexpensive chemical to be a life saver. About 3 years ago I made a video on it and it still gets views, and comments. Some folks are worried that Marvel might damage a modern car's Catalytic converter, or other components. It wont. It's safe to use in the fuel and oil of any modern or vintage auto, and I'd highly recommend you give it a try!

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[ericvonsiebenburg]

It is composed primarily of petroleum distillates, including mineral oil (60%), mineral spirits (10–30%), tricresyl phosphate (an antiwear and extreme pressure additive in lubricants, 0.1–1.0%), ortho-dichlorobenzene (a softening and removing agent for carbon-based contamination on metal surfaces, 0.1–1.0%), and para-dichlorobenzene (a precursor used in the production of chemically and thermally resistant polymers, <0.1%). I cannot reveal how I know this, just know MMO started cleaning aircraft engines since 1928. People's lives depended on it. It will not hurt any automobile engine - never has if you follow the dosage directions on the container. It's especially good for cars with high mileage. Listen to this guy. He's an honest man.

[dodgeman]

It smells great. I Splash little on as cologne. Drives the ladies crazy🤣

[peterkinberger]

In the Marines we used to use Marvel to clean and lubricate our rifles and weapons. It worked great and reduced cleaning time in the field.

[franknew]

Well said Farpoint Farms. Back in 2016, the mechanic who had just replaced the fuel pump in my 2002 Chevy delivery truck said using some Marvel Mystery Oil in the gas would keep the fuel pump lubricated and it would last longer. He said MMO would clean the entire fuel system as well as improving the gas mileage. I also started to add MMO to the gas of my 2002 Lincoln Town Car, and the highway mileage increased at least an extra 1.5 to 2 miles per gallon. With Walmart selling the quart (32 oz) size for $3.88, I am actually saving money using MMO because I am using less gas.
About two years ago, I started noticing a lifter ticking noise in my truck which now has 146k miles on it. It was a quart low on oil, so I added a quart of MMO to the crankcase and within a couple of weeks the noise went away. When I had the next oil change, the oil was as black as coal, telling me that the MMO had cleaned some of the sludge out of the engine. I am also sold on Marvel Mystery Oil.

[michaelquillen]

I started using MMO back in the early 80's would use 20% in my crankcase and change every 3000 miles. These days, with modern engines, at 500-1000 miles before my oil change, I top off the crankcase with MMO. Never had an oil-related engine problem.

[larrynsr]

I've been using 4oz per fill up for years in my 03 Corolla. 322, 000 miles now on original untouched drivetrain. Still runs like new. I can really feel the power difference (especially when I let off the clutch) with and without it. I'm sold.

Pretty much everything he has said is true to my experiences. This stuff works as a cleaner and a preventative. It's awesome!

[tommywatterson]

My Dad was a believer in mmo in the fuel tank to keep fuel system clean, valves clean, upper cylinders lubed, piston rings lubed and cleaned. This was in the 1960's.

[ericdee]

Excellent reviews Erik. I remember when my Father purchased a brand new 1967 VW bug right off the show room floor, then during the late seventies the leaded fuel was being phased out, that's when my Father purchased a MMO injector system which was a glass jar that held like a quart and was attached to a vacuum line on the carb which was a timed system that put an "X" amount of drops per min to replace the lack of lead in fuel needed to lubricate to top end and the Sodium filled valves. We drove that VW bug for a couple of decades even to Henderson, NC on a couple of occasions to visit my Mother's Mother (Grandma)
MMO is fantastic and I couldn't agree with you more about the product and I use it as well in my 1994 Chevy Silverado extra cab truck.🇺🇸✌️

[michaelstar]

I am an advanced emissions specialist. I bought from auction an 04 grand am probably never had its oil changed burnt on dipstick 64kmi failed smog. Eng making noise missfiring put mmo in oil a whole quart and in the fuel 16oz fiquered cats were already bad. After running, driving for an hour eng was running much better. Oil change, soak exhaust in dishsoap overnight to try to clean cats. Well it all worked couple more days of driving the m.i.l went off by itself and passed smog... Love this stuff

[MichaelFougere]

About a year ago my 2010 Jeep Liberty 150k miles was giving me all sorts of ticks and light pings, as well as a squeaky pulley noise. I started using 8oz in the crank case and 8 oz with every fill up. One other thing I did was add Lube Guard to the transmission for a torque converter shudder I was getting.

A year later this thing runs so smooth and quiet you can barely hear anything driving down the street. My MPG has improved by about 2-5 mpg on average overall. I'm a MMO and Lube Guard believer.

[JonThieleJoshProducts]

I have used MMO for years and have had no problems. I use it on all my cars and trucks.

[smacksmack]

I use a few ounces in the crankcase, and half a bottle in my gas.
If you do it constantly, it keeps things moving.

[namrednop]

I've been buying Marvel by the gallon since they first came out with the gallon sized, plastic jug. Can't remember exactly when that was? But I've been using it personally since 1969' in everything I own that uses gas and oil. Before each fill-up at the gas station, I always pout-in the appropriate amount of MMO BEFORE I fill it with gas. And on occasion, I'll add a fuel system cleaner at the same time I add my MMO. And I've never had any related vehicle or equipment problems doing this all these years. My truck holds 6.5 qts of oil, and when I service my truck I always put in about half-a-quart of MMO with the additional 6-qts of oil. Pouring most of the MMO directly into the oil filter and filling it to the brim before screwing it back on. Was taught this by an old-timer mechanic, of which NOW I'm also an OLD, retired - old-timer mechanic. Used and suggested it's use when I was a full-time mechanic to all my customers too. Just buy it and know that it's going to help keep things running smooth and trouble free for many, many years to come. Selah

[MACPAIN]

real facts about cars is never useless information!

[bennjackson]

I've used marvel mystery oil since the '60s and I've used it in almost any kind of car that you can think of. This stuff really works.

[elpaso]

MMO is perfect in the cold and helps the oil flow right away when it's 35 degrees ( in my 87 wrangler ) and I will always reccomend it to everyone

[mr.k.i.s.s]

If you have doubts about something, you can always use less of the recommended amount to see how your vehicle reacts to it.

[skittykitty]

I went to tech school for auto service. On the very first day the very first thing the teacher did was write "M.M.O." on the chalk board.

[danielwhite]

I have a 97 Ford Ranger that I religiously replace one full quart of my normal engine oil with Marvel Mystery Oil. I did this same mix on my S-10 with a 4.3 and finally ended up pulling the engine and selling it since I was junkies out the rusty body!!! That engine is still running in my buddy's truck, uses NO oil in 3000 miles and all total has over 350000 miles on it. Marvel Mystery oil has well proven its worth with me....