Marvel Mystery Oil

Messages
185
Location
Pacific Northwest
https://www.marvelmysteryoil.com/media/1758/mm12r-50094-0818-sds.pdf ~65% Petroleum Distillates (Mineral oil) ~30% Stoddard Solvent (Paint Thinner) ~1% Tricresyl Phosphate (an organophophate, used as a plasticiser and solvent) ~1% Ortho Dichlorobenzene <1% Para Dichlorobenzene Personally, I think it smells great, but I don't think it's a magic elixir for engines. It's probably pretty safe for freeing up lifters if you don't add too much to the oil. A snort or three in the gas is fine, too, though I probably wouldn't use it on modern stuff.
 
Messages
404
Location
pa
I've used it for years in mowers , tractors and even my vehicles..in the fuel, never tried it in oil
 
Messages
547
Location
Houston, Texas
I have an old Jag 6 cyl that hasn't run in 5 years but will again soon when a fuel tank is sourced. I took the intake manifold off and cleaned out accumulated oil vapor gook. Was thinking about filling the cylinders with Marvel to soak the rings.
 
Messages
2,281
Location
Pennsylvania
Don't forget....the presence of the chlorinated stuff . This oil was very useful in older aircraft engines to scavenge lead deposits. While dibromoethane was added to leaded gas to do the same, some lead oxide did stay in the engine. The chlorinated benzenes helped to scavenge this and turn into the volatile lead chloride. Today, I think we use it almost entirely for the solvent properties. It will dissolve gunk.
 
Messages
2,895
Location
Richmond, VA
I put in a quarter quart about 10 miles before I changed my oil last time. I have a small knock and wanted to see if MMO made a difference. It did not, lol.
 
Messages
14,089
Location
Central NY
I dumped a quart in the engine in my truck right at the end of the first oil change interval on it --- it's a junkyard engine with unknown history. I don't know if it helped losen anything up or not.
 
Messages
34,348
Location
NY
Originally Posted by Barkleymut
I put in a quarter quart about 10 miles before I changed my oil last time. I have a small knock and wanted to see if MMO made a difference. It did not, lol.
10 miles? Why bother? lol
 
Messages
1,255
Location
Elizabeth. Colorado
I had a 99 Durango with a 360 that would knock on 85 octane regular or 87 octane mid grade in the summer. Forget turning the AC on too. 91 octane premium would be ok so I guessed it was deposit on the pistons related. A friend suggested MMO. It took about 3 tankfuls and I could run it all summer with the AC on on 85 Octane regular. All my vehicles get a splash with every fill up now... just because I can and want to.
 
Messages
7,462
Location
Mahzurrah!
It's handy stuff. I used it in the gas of my last Jeep religiously, it ran better and got better mpg too my guess working as an UCL. I've used it a few times as a crankcase cleaner, it is pretty mild in that regard but it can help. Had a couple vehicles that I got caught with summer oil in the crank when it turned cold, some MMO made a dramatic difference in cold starting until I was able to get it changed out. Works really well as a gun cleaner too. Crud just melts off with it. I have used it as a gun lube as well, although it will dry out a bit faster than many gun lubes. Then there's OPE.... Like I said it's handy, and not expensive either.
 
Messages
4,220
Location
Massachusetts
I agree with Astro. horse You have to do at least a little bit of research. The forum gets diluted almost as much as adding MMO to your crankcase oil.
 
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