Marvel Mystery Oil

[waxworm09]

Does anyone know if this stuff is any good? I bought a quart to add to the crankcase when I change my oil tomorrow. My Tahoe takes 6 quarts oil, so I figured instead of buying a 6th quart of oil for almost 4 bucks I would just use a quart of marvel for the same price.

[highlife4me]

The stuff has been around for over 85 years and people still use it. I have never used it in my truck but I put a little in my small engines when I change there oil. I use synthetic in my truck so I don't know if there would be any benefit using MMO in that.

[1968]

Personally, I would only add it if I were trying to slowly loosen up sludge on a negelected engine.

Otherwise it's all oil for me, just like the book calls for.

[spearchucker]

Don't see the point of this unless you are trying to clean things out. If you have maintained the engine and kept up on oil changes there should be no need for it. MMO is going to provide less lubrication than an equivalent amount of engine oil.

[theoilman]

From what I have been able to find out, it is correctly named, "Mystery Oil."

Marvel goes out to any and all oil companies to buy 'clean-out' (when an oil manufacturer changes the filling machinery from one product to another the left over in the lines usually can't go as either product but is scrap) oil and anything else they can get for pennies on the dollar. Marvel then takes and mixes it all together, using any primarily ATF as a viscosity control component getting it to the approximate viscosity they want. The mix then is truly a mystery - a combination of who knows what (and they don't know either) of engine oils, gear lubes, transmission lubes, industrial and commercial lubes, hydraulic lubes and more.

I can't think of anything of mine I would trust to put this in.

[Scott K]

Interesting! I have always used it in my airtools, and seemed to work good for that. I have never used it in anything else, and now, I know I wont!

[harvey lee]

I know a shop that swears by it

[mechanico]

I use their deisel additive and air tool lube. The both work great.

[jwhjr]

I also use it in my air tools. Nothing in an engine though.

[broken_line]

i use it on my sleds.. i usually add a bit to every tank of gas and watch the temp gauge.. if the oiler quits i have a miniscule ammount of oil to keep it lubed till i notice the temp is going up. ive used it in small engines such as snow blowers and tillers and in my opinion it works GREAT for removing junk and sludge from motors..

[Eric Wettschreck]

There is NO WAY I'd put this stuff in a crankcase of a 4 stroke motor.

Having said that, I've used it often for breaking loose frozen motors, in my air tools, and as a penetrating oil and it worked wonderfully.

[caseymcq]

From what I have gathered here recently, it goes well with Slick 50

[Dozer]

I works well for removing moisture from the crankcase of a sunken 4-wheeler. 2 oil changes, half MMO half engine oil and they are ready to hit the mud again! Other than that Ive never seen it used for anything, every shop has a can on the shelf though!

[Dave S]

We used to use MMO to spray on sheets of aluminum to help lubricate turret press punches when punching close proximity hits at a high speed. It would help in keeping the punches from galling up and tearing the .080" material between hits.

A couple issues we ran into was 1) it wasn't compatible with our wash system for our powder paint line and 2) it gummed up the conveyor belts on our deburring machines and transfer that onto parts.

I don't know this for sure without looking at an MSDS, but I have been told that MMO has parafin wax in it.

[PurpleFloyd]

I know a shop that swears by it

Possibly because it keeps them very busy? Just sayin.....

[theoilman]

Since all petroleum oils have a parafin content (some a lot less than others) and MMO contains many miscellaneous petroleum oils, it definitely has parafin.