Glasstream15

My uncles and my father had it in their garages when I was growing up. I've had it in mine since. It's a fabulous air tool oil also. But I have not tried it on guns. What I'm doing works now. Don't think I'll change.

Texagator

I use a mixture of Marvel Mystery Oil (75%) and Slick 50 (25%) for a lube only. It is incredibly slick and one mix will last for years because a little goes a long, long ways. It's excellent for slides and bolts but you have to be very cautious to not get it on your grips. Again, a little goes a long ways.

I have personally seen people use straight MMO in air tools and on AR-15's.

Texagator

Deleted - Double Post

edlmann

A personal favorite from early TV ads:

Danwin22

I use Marvel Mystery Air Tool Oil as an after-run oil in my model airplane engines.

dksac2

Use MMO to clean, but not as a lube.
It's to thin to do the job.

John K

RdHwk45Colt

I remember reading on another forum from a gent who was using MMO:Mobil-1 50:50 as a cleaner/gun oil. I've been wanting to try it, but the person who posted it neglected to specify what viscosity of Mobil-1 he used. I've been hesitant on that basis.

Danwin22

I use Marvel Mystery Oil as an afterrun oil in model airplane engines.

Many engines get gummed up and stuck from running and then putting them away for a while. I lay stuck engines on a 25 watt light bulb for a while to warm up the old oil.

Model diesel engines are worse than glows but if you squirt a little MMO in the intake and exhaust ports it will turn over freely 'til the end of time.

Air tool oil is used for engines too but certain brands will inhibet diesel engines from running if you don't clean them well. Marvel Air Tool oil works fine.

smithnframe

I used to pour it down carbs when they were still on motors! Now I use it in my homemade bullet lube mix.

acepilot

Nope. I do use it in my airplane engine though!

Ace

Noah Zark

My late grandfather used MMO since the 1930s in his vehicles and started me to using it.

I've used MMO and STP in a 1:1 mix as a case lube for resizing and forming. I apply several drops of the mix to a un-inked stamp pad and roll the empty cases across the surface of the pad. There's a very slight amount of the mix on the case, and resizing force is lower than with any other case lube as measured with a Dillon force gauge.

I blended up a pint of the MMO/STP mix in 1981 and just over half of it is still left 31 yrs later.

In the garage I've used it as intended, as a fuel additive and oil additive. I have 170K on my 2000 Subaru and it still does about 4500 miles per quart of oil for consumption. I've ran my 2001 Toyota for as long as 10,000 miles between changes since I use synthetic in it, and there is NO oil consumption in 10K.

MMO is extremely effective at helping to break loose seized engines -- just inject one oz in each cylinder and rock the block from side to side every 15-30 mins and let stand overnight. The next day the crank will turn, either by hand or with a "nudge" from a breaker bar.

And like many others, MMO is my standard air tool lube. Marvel makes a product specifically for air tools, but it's much more expensive and MMO works exceptionally well.

Noah

Wisconsinshooter

I will try it, can't hurt anything.

OldCrow

WD40 was the most highly recommended weapons cleaner lubricant on the planet until primer quality went downhill. If it penetrates better than WD40 it is sure to penetrate primers rendering them useless.

3482jl

We used to use Marvels on our break-action ( OUs & singles) trap guns because it worked like grease , but wasn't as thick. I don't think I'd use it on actions with more moving parts though because I prefer a light oil like Rem-Oil or Hoppe's.

OldCrow

When oil burns on steel it leaves carbon deposits. In time the carbon deposits build up enough to adversely affect the accuracy of a weapon. Only oil barrels when storing the weapon. When cleaning the weapon for use use a dry patch to remove as much oil as possible.