Anyone Used Marvel Mystery Oil in Early F Engine Distributors?
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The FSM specifies engine oil.
MMO is in fact, a mystery. No specification for viscosity, TBN, detergency, etc. Hard to say if it is good for anything since it's qualities are unknown.
MMO is in fact, a mystery. No specification for viscosity, TBN, detergency, etc. Hard to say if it is good for anything since it's qualities are unknown.
Off topic, but my old ford tractor's dist. is the same. I've always used motor oil.
But it does have a minty fresh smell.....and when I double the dose in my gas tank.... the F engine exhaust smells like peanuts...
Ya Know....I wonder what kind of indication those tail pipe sniffers would give if they got a snoot full of ‘peanut’ smelling exhaust gas....
We need a volunteer.....
1911
chupacabra
FWIW, I’ve used Marvel Mystery Oil as an “upper cylinder lubricant” gas additive in old motorcycle engines that have no or poor valve oiling systems, and it works well enough for that. I mostly just use diesel fuel for that now, it’s a lot cheaper and always on hand.
I've always wanted try mmo. Never have.
Last edited:
1MOA
SILVER Star
I had a 1993 ford 351w WITH ABOUT ZERO oil pressure in in and ran 4 qts of oil and 3 qts of MMM in it to see if it would loosen up and damn if that stuff didn't flush it out. Ran it about 100 miles and the oil change looked like melted licorice coming out of the oil pan. I ran another flush of the same set up for another 100 miles and it came out dark honey colored.
I dropped the pan and cleaned out the trash and that motor has hummed for almost 20K miles since then.
I had a 2F seized when I got it. MMO in the oil, spun the oil pump with a Black and Decker. Still frozen (obstruction at flywheel and bellhousing). A year later, I pulled the head. Those intake valves that had leaky oil seals had chunks of carbon break off like chocolate from a bar, I suspect it was from the MMO. The ones that were still dryish experienced an extensive process of cleaning using a wire wheel on a grinder. I suspect that one Mudder who was rehabbing his motor with MMO got a big chunk of loose carbon stuck between the electrode and grounding strap on his spark plug, and had to limp home on 5 cylinders. I don't know for sure, but, I'd be sure to carry a spark plug wrench and a wire toothbrush if I was using MMO. MMO in my other 2F definitely made it smoke, but I don't know if it was from the rings, or the valves. So I wonder if it can also create deposits, if oil is polymerizing while it is smoking? I tried soaking carb parts with MMO for a week on the bench, it probably didn't do much if anything.
I'll stick with frequent oil changes and Techron, as long as it has good oil pressure. However, a competent engine rebuilder really shouldn't be a thing to avoid.
I'll stick with frequent oil changes and Techron, as long as it has good oil pressure. However, a competent engine rebuilder really shouldn't be a thing to avoid.
I just used it to clean an old Honda carb and it did work wonders getting rid of the lacquer. I have a '73 40 that has an F.5 that has not turned since 1986 or so. I am probably going to dump some in the cylinders and hope for the best to try to get things to free up some.
