Marvel Mystery Oil. A Review + Some Of Its Uses. 

My Dad used MMO in all of his vegicles and yard equipment and the engines never wore out. I believe MMO works period. I use it in everything that has an engine and never have mechanical failures. it also makes a great aluminium polish and gun oil! Great stuff!

Oh yeah forgotten to tell you.but we will never be late again to her appointment,because basically marvel mystery oil not only fixed almost everything.but now my car is a freKin rocket . thanks for the piston cleaning advice..it drastically. Helped.

I started using Marvel in my '97 Mercury Villager, in the gas. After a few tanks, the gas mileage went from 18-19 mpg to 22 mpg, and it was consistent. Great stuff.

As a mechanic for over 21 years I've used this in all my cars and small engines and air tools sense the mid 90s. and long as they sell it I'll buy and use it.

People listen to this man.he absolutely knows what he's talking about.i took his advice and he saved me n my family thousands.

I believe in it, I have used it for 10 years, and it has worked

Turtle Wax bought MMO years ago . Smart move. my dad being a WWII vet said they used MMO in their fuel on the C47's and C-46's that flew the hump .A private pilot friend of mine said he has been using it for years and of all his buddies who fly he is the only one who hasn't had an engine drop a cylnder. Guess he discovered what the greatest generation already figured out. The NAVY used it in the Corsairs in the Pacific and the AAC used it in the P-51 Rolls Royce 2500 HP super charged engines. I don't know what other prrof you need. If its good enough for a P-51 its good enough for a F150 and my Honda Accord. (Kinda ironic in a way though huh?) Great for Air Tools and lot less expensive. I wipe my guns down with it. Gets rid of rust fast. I like the wintergreen smell.

I am retired now from the military and another career. I make a lot of short trips and during the winter I don’t drive that much. Have a pickup and a car. Sometimes the gas gets old. I use it in the fuel every 3 or 4 fill ups for the last 30 years. Knock on wood, I have never had a fuel injector problem. The engines run smooth. I drive conservatively. Not scientific, but I do believe with conservative driving it makes a little bit better fuel economy. On the truck at the end of the summer I checked the throttle body after about 30,000 miles. It was cleans. The truck uses some oil now. About 100 to 500 miles Before an oil change I add 320 ml to the crankcase. The truck has seen better days. However, I believe this material is good. It is essentially thin naphthaenic pale oil and is a very gentle cleaner on the inside of the engine. It’s been around since 1923 for a reason.

If you have 5w-30 oil and put 1 qt per 4qts oil you will yield a oil viscosity of 1w-26 it lowers the visc by 4w that's what they taught us in engines class in school.

Air cooled VWs love this stuff in the gas tank. Just plain dry gasoline is very hard on the upper cylinders and valves. A lubricant like MMO (or 2 stroke oil but I prefer Marvel) in the gas tank fights rust and corrosion and keeps rubber parts like fuel pump diaphragms and carburetor accelerator pumps from drying out. A lubricant in the gas also keeps throttle shaft bushings from wearing out on carburetors. This stuff has more benefits than people realize especially in old carbureted engines.

Great video Erik. I have a Marvel Mystery Oiler which consists of a glass container that feeds a regulator and is drawn into a vacuum port on the carburetor and can be times for an "X" ammt of drips per minute on my aircooled VW. Being most "unless modified" VW head have sodium filled valves and the lack of lead in today's fuel, the aircooled VW is prone to sucking a valve. I've been using MMO for years, great stuff. Thanks for sharing! Kind regards, Eric Dee.

I've been using MMO for over fifty years. Most mechanics have a bottle of MMO in there shop.

For 10 years, I been using MMO with every tank of gas on my 2 Crossover Vehicles and 2 of my Motorcycles. I watch my MPGs every fill up and for the 10years I been using it, I have always gotten between 2-4 MPG more than when I did not use it. Been buying and using ever since!

Been using this in my personal Ford Van for a couple of years and have had great success with it! I now have 221k miles on a 5.4 engine and runs better than my friend's Chev van with only 60k miles!

@ Farpoint Farms- Thanks for doing such a great video on Marvel Mystery Oil. I have been using MMO in the gas in my car, truck, and lawn mower for 3 years at every fill up at 4 oz MMO for every 10 gallons of gas. Since I have been using MMO in my car, I have been getting 1.5 to 2 extra miles per gallon on the highway. Walmart sells the quart (32 oz) size at $3.88 and at that price, I am actually saving money using MMO with the savings in gas. That's not counting the added benefits of a much smoother idle, keeping the fuel injectors clean, and lubricating the top end of the engine and the fuel pump. Using MMO in the gas of my 15 year old Sear's Craftsman's lawn mower makes it very easy to start, even after sitting over the winter. It will probably last longer than Sears will!!!

According to Marvel you're supposed to use 20 percent in your engine. I developed a lifter tic in my 99 Grand Cherokee which just hit 200k miles. I changed my oil today, this morning,added 5 quarts of Pennzoil Pure Plus Full Synthetic, and one bottle of Marvel mystery oil. I took a trip to my brothers house and back totaling about 50 miles. Let the car cool off, went out a little while ago, and I can already hear a difference in how the engine sounds. Now the ticking noise goes away quicker than before. Goes away now before hitting full operating temp. Before had to be at full temp before noise goes away. I'm going to be putting 350 miles on my Jeep within the next week, I'm willing to bet the ticking will be completely gone pretty soon.

0.5 Quarts in the Engine (with each oil change) + 0.5 Quarts in the Gas Tank (per 20 gallon tank). That formula will keep you out of the dealership with engine problems for the life of your vehicle most likely.

My little 1.8 liter mirage runs like it's brand new off the lot.all shaking is gone' all lifters are silent'my fuel injection is perfect now .my fuel pump no longer stalls.and the best part is my oil control ring slipped back in to its space so no more smoking at all waaà😱? And it's. 2000 so it's officially a antique.

For what it's worth, I had a squeaky hinge on our front door. Tried everything from lithium grease to various lubricating oils, 3in1 oil etc. but nothing ever lasted more than a month at best. Finally as an act of desperation I gave Marvel Mystery Oil a go, and it's been 3 years now, never a squeak since.

Years ago the label stated to use 4-oz per qt of oil, now it says 8-oz.. I used 8-oz in a differential that had heavy carbon buildup and it either dissolved the crud or loosened it up and could be wiped off with a paper towel after a few months of limited use (good stuff). I had a gummed up engine and poured a qt of MMO in the oil and drove it like normal for a month or longer and the engine started to run smoothly, after changing the oil it was night and day difference. A shot in the gas tank also does wonders, no need to use fuel injector cleaner because MMO keeps the injectors firing correctly.. Small engines: I use 1 TBS each of MMO and 2-stroke oil in every 2-gal gas can and have no issues with varnish or corrosion.

I have used a quarter cup of Marvel Mystery Oil after every oil change to my Camrys engine since she was brand new. 17 years and just shy of 400k Miles later my baby girl still runs and purse like the day I bought her. I also add about 628 Oz every other tank of gas and in a recent Highway trip from Miami Beach two shithole Gainesville I was clocking 41 and 42 MPG with the AC running doing about 80 down the turnpike.. I will always use this product.

I think of it as an oil cleaner; it removed deposits in parts of the engine that are coated with oil. So adding 10% MMO to your oil would eventually help unstick clicking hydraulic valve lifters. I would not use it in the gasoline as oil in gas tends to destroy your catalytic converter and oxygen sensors. It thins out the oil, so add the same amount of Lucas HD Oil Stabilizer to the oil to 'thicken' the oil mix back up.

I have been doing that mix to my cycles, snow blowers, and lawn movers for years .My motors have been trouble free for 30 plus years .

The high phosphorus content is why it's such a good cleaner. I've seen it clear stuck lifters before you could actually close the hood after you put some in the engine. But usually it takes 10-15 minutes. With the 3.6 L engines and a lot of these engines that have the hydraulic actuated lifters that the camp followers are riding on it is critical to keep those things clean because oil does not run through them quite readily. Another Engine That Could use it quite often is the 5.4 l Ford 3 valve. It's the only way I know of to clean those oil pressure passages inside the heads that allow the cam phasers to function. And several years ago when they took the sulfur out of the gasoline, about 15 years ago I think now or maybe a little bit longer it makes a great lubricant for the fuel system.

I have Poured it down carburetors to free up sticky valves and that worked every time

Dude I already have 4 boxes full in my garage.i love this stuff.

Thanks for the review. The auto shop recommended this and glad to know it worked for you

I replaced my 5000 hr gen. Fuel system. I used a very agressive solvent in the hole! I scraped all carbon from exhaust port to new muffler. 00ps! The cyl clean took out the 16 yr. Carbon seal. It took 2 conventional 100 hr. Oil changes to stop the oil blow by. Now no oil stench. I will use mmo in the hole next rebuild.

I love MMO. I have been using it for years. I started with small engines, now everything gets it. Oh the Yugo. Get in an accident with one and parts of Yogo here and parts of Yogo there.

it is fairly cheap and does not hurt and has persisted since the 1920s.... that is good enough!

Been using MMO for 30+ years because it works. Cars run better and get better mileage. I won't, and don't need to use anything else. 👍✌

MMO is really good to add to any air tool or air solenoid too. I used to work on factory machines that had air solenoids that would stick due to the air feeding the solenoid having moisture in it. The moisture would make the lubricant in the solenoid to turn gummy. We advised our customers to use MMO in their air lines. It would lubricate the solenoids. It would not gum up when wet. If you just thought, "What is this guy talking about, then this does not apply to you." The folks that need the information will say, "Oh wow, great info".

A Yugo poster on the same wall as a South Pacific nuclear test, there’s something you don’t see every day!!

OMG, I have that same Yugo ad ! I even have a Yugo plastic bag from an auto show when they came out

Techron is a very good fuel injector cleaner. You can also use Top Tier gasoline’s. You can Google the station s that carry Top Tier fuel. They have more detergents. How much who knows they won’t tell you. If you toss in some Techron or Gumout fuel cleaner once in awhile you’ll be fine.

I used this stuff on my 2000 Mitsubishi mirrage de 1.8liter.and now the thing a freaking rocket.

Thanks for the video. I put it in my fuel tank and hopefully will be able to get some mpgs back. It has dropped a little in the past couple of years . I will update in a few days to see if anything happens. 🤞👍* Update - it didn't help with the mpgs. I had the lights come on the dash. Checked it with the code reader. Catalytic converter below threshold on bank 2. I'm gonna replace the o2 sensors before replacing the converter. From what I understand that the downstream o2 sensor is what could trip the code. So it was worth a try. With 150,000 miles , it's time. I did pull the air intake off to replace the bank 1 ( firewall) plugs and upstream O2 sensor. The intake wasn't too dirty. This is for the Toyota transverse v-6.

They finally got this stuff back in Canadian Tire. I had to bug the shit out of the staff to get it in inventory again. I love this stuff. Thanks for the advice.

Marvel Mystery Oil at 200 degrees probably has a higher viscosity than your 20 weight oil and most cars today. It's probably a little bit higher than 30 weight at 200 degrees. It was originally used as a motor oil for World War One radial aircraft engines. In 1923 was bottled and named Marvel Mystery Oil. If you wish to, you can easily run a 1-quart mix in your engine as a standard practice.

I'm a big believer in mmo. I use it at 20% with Supertech 530 fs on my 03 F150 5.4 with 393,000 and it runs silent. I also use it in the gas. I've been doing this since I got the truck from my Dad at 366,000 3 years ago. I've read that the Ford Modular engine likes the thinner oil at startup and my experience with this one convinces me that's true.

Great vid. An ounce of prevention!

Hi Eric thanks for making this video, I enjoyed watching it! I add a little mystery oil to my 81 rabbit at fuel fill ups, and wanted to learn a little more about the product. Never heard of 44k, great bonus footage! 👍

any product that says " honestly so" is a good American product that has proven itself..

1998 Saturn SL2, 110,000 miles...bought seafoam to give it a try. Not sure about engine intake spray, but will give it a try. They say full can...I will use half a can or less to see what it does. Marvel mystery oil is great also.

I have 213,000 on my Trailblazer. Just added my first quart before my oil change. I heard great things too!

Very practical advice man, Me and pop and my brothers used that for years to free up engines and stuff back un the day. The Elvira poster got me to subscribe BTW.

I have used MMO for over 50 years both in oil and gas in a lot of lawn equipment in the fuel I use one ounce per gallon oil I use approximately 20 % there is no replacement for regular maintenance and good quality oil and fuel I use premium fuel 10% ethanol I have never had a problem MMO seems to also stabilize the fuel I have some engines that are very old one uses breaker points starts with one or two pulls for longevity I credit MMO and good maintenance

when my wife has that look in her eye and hands me a bottle of Marvel... makes me a believer ya know.

10/10 for the Yugo poster alone. Nice review

I use the product in my 1997 Buick Park Avenue and my 1981 Mercedes Benz 240d. Great stuff.

Love that Yugo poster!

It's good stuff but didn't help my 454 lifter tick. I used it in the oil per the instructions twice and the ticking continued. I'm not a fan of additives but a friend of mine swears by Motorkote and insisted I give it a shot. I did and haven't had a single tick in more than a year. Maybe MMO loosened it up Motorkote got the win. I still use a rich mix of MMO every 3-4 tanks in my Grand Marquis with 117K miles and it has helped reduce carbon build up. I'm fairly certain it works because I was getting a spark knock under load but not anymore. MMO is also great around the shop. I keep a 50/50 mix of MMO and ATF in my squirt can for rusted bolts and for wiping down tools and saw blades. It's good stuff and at $3.88\quart it's worth it to keep several bottles on hand.

One can of Berryman B12 during every gas fill up, one qt Marvel Mystery Oil every oil change, one qt Lucas Transmission rebuild every fluid change and I swear the Jeep was indestructible.

My recent use of mmo has been 100 % positive. Generators and old truck and newer truck.mileage has gone up with all I do.

You forgot to mention it smells great! Or maybe I'm weird.

Id even use it as a break-in or after run oil for all my gas r/c,s

I use this or Lucas UCL in the gas to help break in OPE engines when they are brand new. Break in the rings gently. Those engines seem to burn almost no oil during their lives.

I use 30% marvel, 40% Techron 15% B12 chemtool, and 15% royal purple max clean. 6 oz per fill- up.

I run mystery oil in my 2015 genesis before and after every oil change it makes my car run quiet im at 51k miles the key is to start early to keep carbon deposit from building in the first place

I got a bottle for a slight valve tick. Most people probably wouldn't notice but it was bothering me. I don't particularly want to remove the intake, cowl, etc to access the valve cover in this cold weather. I didn't want anything too harsh so I used half a quart of mmo (2 oz of that was in the tank) and it's significantly quieter after about 50 miles. I'm due for an oil change soon and will probably use the rest then and repeat every year or 2

i occasionally put a little mmo in the gas of my vehicles but i put some in the diesel for my tractor every time.

I use mmo on a 6 qt 5.3 vortec. 5qts Castrol 5w30syn and 1 qts mmo. I feel the pick up increases and I drive 5k intervals. I also get laid close to nightly but I can’t say it has anything to do the mmo but I’m sold either way.

I soak impossibly frozen spark plugs with it..just spray it on good wait 3 hrs spray it good again and let it soak in all night and it's like unscrewing a spark plug stuck in butter.

Very good advice

MMO is very good as a additive and I have been using it for years. The original Slick 50 was the best additive I have ever seen and worked wonders. Seriously, a 10 mpg jump in a '80 Sunbird w/a 2.5L. From 31 to 41 mpg! In fact it saves my motor after a bad head gasket FILLED the motor with antifreeze. That formula was around only a couple of years and was changed because of legal action; never worked worth a damn after.

bought a lawntractor from a person who never change the oil , i changed the oil and the oil did not take long to get dark, my question is , how much of the marvel should i put in the oil before i change it again ? i am sure there is still alot of crud in there, GREAT INFO !!!!!!!

I just add a shot in $20 of gas in my old 4 cyl and I can feel it. I'd do a blind study and prove it because when I skipped it it was obvious. . Its normally a week ass car and if there's any extra power coming its noticeable.

Fantastic stuff and you are using it correctly thank you!

since the freaking 20s???? Wow congrats to them!

It's great as a penetrating oil too.

Great vid. For a 57 chevy and a 64 vw bug ..how much would u recommend to use during an oil change?

I have used MMO for years also. "GREAT STUFF" i like your mushroom cloud photo just blasting off. Where did you get that?

I use it in every 3rd to 4th fill-up with my gas. I might occasionally use it by mixing it in with the oil. But 500-1,000 miles seems a bit long on diluted oil. I probably go 60-80 miles before draining it.

i have a question bud ,,,i heard for marvels an awesome oil ,,but i have an extreme condition ,,,i have a 55 fairlane with a 292 ci ...the engine is from 1960 ,,from what i know of the car ,,,perhaps 148,000 miles on it ..at least that what the odometer says ...and it works ,,thing is ,,,,,,i have a weak cylinder ,,,or 7 out of 8 ...the motors been tuned up...runs well but on the highway ,,,ill get a serious blue puff of smoke every so often ,,,ive put in bardahls no smoke and it helped ,,,,im wondering if the combination of bardahls no smoke and marvel mystery oil with help even more ,,????i think the motor has allot of promise and would like to save it for authenticity .....

So do I pour this into my gas tank ? My car is a 2004 Chevy Malibu and runs sluggish! Specially when stopping then pulling off again it barely wants to move. Will this help fix that ?

My family owns a 1954 Mercedes 300B sedan (gas), ran fine until 1970 when it was put in the backyard in North Texas (very dry area). In 75-76 or so had an electrical short in the dash so stopped turning it over then. Took out spark plugs, flooded cylinders with Marvel Mystery oil and replaced the plugs. It hasn't been turned over since 1975. I wonder if it's at all restorable???

Thanks for the help.

MMO can even help a Hugo now that's saying a lot

Thank you for your video and all the good info.

i have a 94 sunbird i did not start for a year. it cranks over but will not start, would a little bit of mystery oil in the gas tank help at this point or not ? i am hoping when i crank it over with the mystery oil that it will go through the system . Great content you have, keep it coming!!

What about using MMO in my new GDI engine that they claim has carbon buildup on the valves after awhile ?

I’m testing this stuff out in my gas and haven’t seen or felt any difference yet. I feel like it improves gas mileage mostly in older cars from what I’ve heard. Gonna still use the whole bottle tho🤷🏻‍♂️

Works better than WD-40 on tight bolts. Lubrication for everything else too.

I run mine 6 quart pennnzoil platinumOn my 06 300c 1 quart of Marvel mystery oil the engine is spotless also my 2013 Mustang Gt Highly modified use 7 quartsMobile super synthetic For 3000 miles also add 1 quart of mmo With a wixp or Fram ultra on both vehicles . Also used in the fuel since new never a problem

Nice vid

I use the engine break in oil on 4 stroke racing mower and go kart engines.

great information!

How long/hours do you run with mmo in crankcase on lawn mowers - zero turn Brigg's and kawasaki engines before oil change?

Perfect to run in Japanese SU carbs.

Would Marvel Mystery oil mixed with gas oil mix in 2 stroke chainsaws and weed eaters clean the carburetor?

The concoction that you mixed up, is that for a lawn tractor or a diesel tractor?

My 2001 BMW 325ci uses 1 qt per 1000 miles. The model yrs 325i series BMW changed the lower oil control ring and the pressure spring doesn’t seat as well causing the oil burn. No smoke or anything but will MMO slow oil consumption?

Hi can I use marval mystery oil in a petrol lawnmower mix with the petrol same as 4 stroke oil ??

I LOVE THIS STUFF

You should make more automotive videos

Enjoyed the video! Would this be good for my 1990's sedan?

After regaping the points on my 289 ,,I applied some to my pointscam with a Qtip.. ld like to know if you think was good idea, or not.. Also seemed to help the fuelpump on 93 Chevy PU..

Nates Interactive has a video using Amazon Basics full synthetic showing MMO has a good anti-wear additive also. The Amazon Basics with MMO did better with MMO added on cold pour and Labrinsky bearing test than the Amazon without.

Ok, I have a perfectly good qudrajet on my 454ci in motorhome. It sat a while and I had too spend hundreds of bucks cleaning the gas tank and fuel lines, replaced both fuel pumps, fuel regulator, filters (AND) HAD TOO GET THE QUADRAJET REBUILT! I told the shop I added mmo too my 6 qts of oil too help clean the inside of the engine gummed up bad with bent and broken push rods and stuck valves and lifters, which I had too replace everything anyway I told the shop I was thinking of using mmo in the tank! I am not in any way trying too go against MMO but, His face lit up red and he gave me a 5 minute lecture on what gas/fuel additives do too the inside of a carburators/TBI ALSO. He said never put any additives in the gas. It's not good for internal parts of a fuel system! Now like I said, I like MMO, I have been using it since the late 60s and believe in it but, when the top carburator shop in my area says what it does to the inside workings of a gasoline/fuel system I believe it. I will keep using it in my oil but, not in the gasoline! By the way, that carburator rebuild cost me almost $400. So I'll take his word for it! Anyone who disagrees with my findings I'm sorry, you have the right too use it if you like, I agree too disagree with you! Fuel systems shouldn't be played with! Engines are built too run on combustible liquids and not oils!

I have feeling this product is equivalent to UKs Redex ucl. Though I've never put Redex in the sump!!.