Model T and Marvel Mystery Oil

jchochole

jchochole

Senior Member
Gents,
Has anyone had any experience using Marvel Mystery Oil in Model T? In the gas or oil? I know the bottle states that up to 20% can be subbed with MMO- wondering what T'ers have found in using it.

Thanks,
Jim from IL
 
Jim-I use it in my T and A. I just pour some in, no measurement; several ounce's. More important I have found out the hard way to use staybil or a gas stabilizer in the winter. Two yeas ago I did not and the carburator looked like it had red jelly in it. Doesn't cost much. I do not use it in the oil. I use synthetic oil in both cars. Good luck.
Abbie
 
I noticed my T carb ( a Holley NH) using a high flow intake would ice up after a few miles of cruising speed and began to spit. Loading it on a trailer once you could see the ice build up outside the throat of the intake.
One of the oldtimers told me to add marvel oil to the gas and it would stop.
Been using marvel in my gas every since !! Got to be good for the valve guides as well......
 
I always used Marvel in the gas and oil of all the old cars (and stationary engines) I had. I think it's basically a very high detergent but I have no clue what on earth it does to the gas. Just seemed that things ran better when Marvel was in it. One observation from someone who has been around old engines all his life is that for some "mysterious" reason the difference in performance is much more profound in a flathead engine. Just my 2 cents
 
Bubba, put the heat stove back on and the icing will stop. I used to use MMO in my T. Haven't lately, no reason, just don't anymore. ATF is very high in detergent and I heard is one of the components in MMO.
 
MMO is nothing but solvent. It was invented to clean carbureted fuel systems and no more. You can get the same "benefit" by adding paint thinner to your tank. It does have a great placebo affect on a lot of people. I've heard it adds years of use and helps everything from old shoes to grandma's rheumatism. :rolleyes:

This MSDS is from 2006 so it may no longer have the chlorinated HC. But you get the picture. :cool:
 

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Bottom line: Those that use it swear by it and those that don't............well they don't. (I don't either). Probably just adds to the pollution T's put out.
 
I've use Marvel in lots of old engines and it works great. Especially in older motors that have been sitting awhile and have gummy valves or piston rings. I have been told be more than a few people that MMO should NOT be used in a new engine as it could prevent the rings from seating properly.
 
I find a little 2 stroke oil in the gas helps lubricate the valves on engines like the two below with no provision for valve stem oiling other than the oil can once in a while. No mystery to it & it is meant to lubricate & then burn away with the fuel.

One should be careful with any additives in modern cars. The Oxygen sensor can be easily ruined and in some cases the fuel
gauge sender is sensitive to some chemicals.
 

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I use MMO in all my old cars including a 60 Oldsmobil , works for me never any problems with stuck valves and they start right up in the spring. I'm a beleiver. The Olds had a tendensey to have noisey lifters when they were new and mine has never had a lifter make noise. My flatheads and T's always run smooth and start well. Frankpkny
 
In 1949 my Uncle bought a brand new Ford, and before he took it home he had MMO installed and when he reached 49.0oo mile he pulled the heads, and there was not wear. So it must work. His oilere had the metal can, and I had one on a '34 with a glass can, that was when I was a teenager so cant say what it did in lubing my engne, as I would adjust the metering to my own making.

Bill D
 
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