Marvel Mystery Oil - Silly Old School Snake Oil, Or Can This Stuff Actually Work

To Keep the fuel pump clean, add it. To keep" injectors clean add it. To clean a pocket watch, dump it in & wait til tomorrow. P.s. after opening up the tank of my 91 toyota ( at the time it was 27 yrs old) the tank was pristine') the original electric fuel pump finally died

I used it for my '64 GTO Tripower and every vehicle since. I recommend it to everyone!!!!

Yeah, I use a few shots of it in my Honda's oil. Reduces head clatter on startup!

Can you use it with flat tappet engines?

I did an engine flush on a truck …one quart of mystery oil and the rest regular 10w30….removed the sludge and crap it had…tan it for 10 min…then did the oil change again….works wonders on old fuel pumps

I use this all the time. Specially on lawnmowers, chainsaws, it works fantastic…

Marvel Mystery Oil is a part of growing up, aside from using it, I lived in Port Chester NY for a while and my local motorcycle shop was across the street from Marvel Mystery Oil and up the block from the old Lifesavers candy factory.

It works! Been using it for years in all my storage fuel 2oz per 5 gallons and un my trucks fuel tank. 8OZ per fillup mostly Winter Time. Truck outside. Pulled my Ariens Tecumseh carb bowl down yesterday
Perfectly clean. I do use it in conjunction with Stabil products in storage fuel as well. Its been around all these years because it works!

i use alot of mmo. i treat all of my small engine fuel with it and staybil.i also use it in the gas and oil in my cars.
every winter i add it to the oil for better start up protection and a little cleaning. i also use it in the fuel and ive noticed mpg increase.

Hello My Friends
I once bought a 1959 single can VW truck that had been sitting for many years. The valves and lifters were all gummed up and sticking. I drained the old oil. Put fresh oil in the engine with a bottle of Marvel. I also put some in the gas. After a few miles everything loosened up and the engine ran fine. After a day or two I changed the oil again. That truck ran fine for years. Marvel oil is also good for laying up steam equipment as it doesn't seem to dry out. I dose the cylinders and valves of my steam locomotives when shutting down. The next time you run the engine you get that lovely Marvel oil smell.😎
Jack

I've heard hard core racers say that it can't be beat for storing an engine for the off season by spraying some into the sparkplug holes and turning it over a few times. No scratches in the cylinder walls from rings when first cranked after sitting a while.

Hey good day, I have used marvel mystery oil since about the mid 1970s. I am only 68 years old :-) lived breathe and worked as a mechanic most my younger life and still do stuff for myself and others on occasion and blah blah blah. But I have always sworn by the marvel mystery oil. have you been put it in automatic transmissions in minor doses and it seems to really help on the older trucks 80s 90s whatever. As well as I would use it as a floor, wax, a cake topping, and even drink a shot if I knew it would help that.🙄😬😳🙃😂 thanks for this, you’re the man! Learned something new about it today! Keep up the great work stay well. Have a beautiful day.👍👍👍🙏

I've used this on a couple of planes. 4 ounces in the oil and 2 oz in the fuel and then go fly for an hour or so. It does work.

You have to be careful putting too much of this stuff or seafoam in an old engine.... it can also break loose too much crud and clog the oil pump or worse.
I've seen engines ruined when too much sludge was flushed through the system.

Do not use if you have a fuel tank Caswell coated. They specifically mention it not being compatible.

As VGG says, it's a mystery, nobody knows whats in it.

Do you think it would be better to use a JASO-FD spec two stroke oil as an additive for gasoline; compared to Marvel Mystery Oil?

Because that's what I do in my car.(which is almost as old as I am)

alcohols was even longer some claim it works well , some telling that is just masking the actual problem, so go figure

marvel mystery oil has a decent amount of naptha in it, naptha cleans paint brushes and is a solvent , and why marvel mystery oil is good in mower , weedeater etc gas to preserve carbs that sit with gas in them ,it slows varnish residue of gas from ruining carb parts . about 1/2 ounce to a tank full ,run it for a couple minutes and then turn it off .

Use it in my old 800 ford gas tractor to keep the valves from receding into the cyl. head ! put it in the gas.

I think you have it backwards. It's 2/3 mineral and 1/3 Stoddard plus some additives at less than 1%.

Originally designed for WW I aircraft. I dad was one of the original founders of the PVTA , Pomona drags. I was raised around Marvel, STP and transmission fluid for additives. Sea Foam does a nice job too. Preventive maintenance works the best...

Over 100 thousand miles on my Alfa with Spica mechanical fuel injection. Add few ounces to each tank of gas.

.More anecdotal data, including the comments. Not one proves cause and effect.

Seafoam goes both in oil and fuel

Started delivering gas to gas stations in 98. Mobil's tagline was 'Drive your engine clean'. Then BP bought Amoco, Exxon and Mobil merged, the amount of additives in gas got cut in half. I've hauled gas for 6 brands and they are no better then unbranded generic fuels. Except premium, it has up to 6 times the additives as regular, my point is any additive will help your fuel sysytem. All fuel I haul has 10% ethanol (Federal Gov takes 5 cents fed tax off per gallon if added, so all regular has it in it. Some terminals will sell premium without it for folks with chainsaws), so this lubricant will help with keeping rubber seals plyable and not hard from the ethanol.

I use it to lube lightly friction apps,and have used it right before a oil change ,,use as a cleaner .

🦅🌎⚓️

Unkle Tony .......
Four Generations of my Family have been using MARVELS MYSTERY OIL and It is a SUPERIOR Instrument for Internal Combustion Engines.........
Thank you for your VIDEOS Sir.......
Please keep the Message and Mission Coming......

Do you use it to bring the oil level to full or add it to an already full system which would be overfill?

It is used by every methanol fueled race car to pickle the fuel system between races to prevent corrosion

I know old guys that put that in their Model Ts. They claim the same thing. It helps keep the gas from evaporating as quickly.

This kinda crap and seafoam will destroy af ratio sensors

This can be used as a lead replacement for old engines. During the war they used it to break in the aircraft engines. I have watched it have a positive effect on small engines when added to the gas. If you are having problems with an engine running roughly, try adding some of this to the gas. Hope this helps.

I used this in a 351 modified 400 and it cleaned the gunk out so well the gunk clogged the oil pump causing catastrophic engine failure.

Semper Fi, Uncle Tony! Thanks for the great explanation!

I like the stuff. It’s cheap enough.

back in the 70s I serviced nabisco box trucks GMC v 6s and they had a metered canister attached to a vacuum source ....and btw they had the oil drain plugs spot welded ....all we did was change the oil filter every 3000 miles and ran quaker state oil and i saw very high mileage engines over 200,000 miles imagine that

Hey Tony! Anybody here have experience with Ohio Crankshaft's 360 stroker cranks?

Rislone freed every sticky lifter that I or my friends ever had. At least 4 vehicles that I can remember

I used to use this and a heat gun to recondition the black trim on my jeep

Great video. MM oil is used widely through out general aviation. Unfortunately the cost has doubled over the last couple years.

I still use it. Started as storage oil for the race engines, but I use it on all three Toyota's, the newer ones, as a regular PM on oil changes.

I have use marvel mystery oil for years, but I was wondering on new cars would affect the catalytic converter

Lard when applied to hot iron forms a smooth nonstick surface. Think cast iron pans.

I’ve used it for years, wash my hair with it, brush my teeth and wash my clothes in it. My hair is shiny, my tooth is a light tan color and my clothes don’t even need hangers to stand up. Best of all my Duramax hasn’t needed injectors in 300,000 miles.

Its just ATF