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Old 10-14-2020, 05:59 PM   #1
jason78613
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Default Marvel Classic Motor Oil

Newbie here, just bought a 1938 Ford Standard and runs great. I'd like to keep it that way. I've seen some posts touting Marvel Mystery Oil (MMO), which I will start incorporating, but has anyone tried using their Marvel Classic Motor Oil, specially formulated for classic cars? Looks like it may be a new product as I can't find much info on it.

https://www.marvelmysteryoil.com/pro...sic-motor-oil/

Last edited by jason78613; 10-15-2020 at 07:04 AM.
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Old 10-14-2020, 06:15 PM   #2
drolston
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Default Re: Marvel Mystery Oil and Marvel Classic Motor Oil

It is probably a really good product for old flatheads, with increased zinc for our flat tappet cams, and detergents to prevent sludge build up. But at $9.00 per quart, plus shipping, it is a little expensive. My solution is to use one quart of Valvoline TR1 racing oil for the zinc, and four quarts of any other good oil for the detergent and other additives.

I put about half a pint of MMO in the gas at each refill to keep those valves from sticking. Which they absolutely will do.
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Old 10-14-2020, 06:52 PM   #3
alanwoodieman
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Default Re: Marvel Mystery Oil and Marvel Classic Motor Oil

Kendal 20w50 or valvoline 20w50, put mmo in gas tank according to directions
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Old 10-14-2020, 06:59 PM   #4
39portlander
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Default Re: Marvel Mystery Oil and Marvel Classic Motor Oil

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Originally Posted by alanwoodieman View Post
Kendal 20w50 or valvoline 20w50, put mmo in gas tank according to directions
"a spoon full of sugar helps the medicine go down", on my "non modern" vehicles and yard equipment I add several tablespoons of MMO on every fill up. Big Blue my 77 F150 and the 39 seem to also like the 20-50, it good stuff.

MMO does it help? well.... it make me fell good

Last edited by 39portlander; 10-14-2020 at 07:04 PM.
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Old 10-14-2020, 07:20 PM   #5
VeryTangled
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Default Re: Marvel Mystery Oil and Marvel Classic Motor Oil

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MMO does it help? well.... it make me fell good
Put me down for another one who uses it in the fuel tank. But I honestly believe it's snake oil and I feel like a rube for doing it.
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Old 10-15-2020, 06:58 AM   #6
mfirth
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Default Re: Marvel Mystery Oil and Marvel Classic Motor Oil

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I knew a guy who worked for Delta airlines....they used MMO in all of their ground vehicles.
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Old 10-15-2020, 07:17 AM   #7
51 MERC-CT
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Default Re: Marvel Classic Motor Oil

Just wonder how many millions of vehicles never used MMO and never had problems either real or imaginary.
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Old 10-15-2020, 07:30 AM   #8
Jacques1960
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Default Re: Marvel Classic Motor Oil

In addition to the above uses, real or imagined, its minty freshness also makes a solid case for use as a beard conditioner.
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Old 10-15-2020, 07:31 AM   #9
alanwoodieman
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Default Re: Marvel Classic Motor Oil

ever had a stuck valve in a flathead? if you did you would swear by MMO! if it is snake oil, but be a good snake
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Old 10-15-2020, 08:14 AM   #10
Charlie ny
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Default Re: Marvel Classic Motor Oil

Shell Rotella 20-40....sourced at Walmart + a swig of MMO.
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Old 10-15-2020, 08:24 AM   #11
Tim Ayers
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Default Re: Marvel Classic Motor Oil

Seriously asking: Is MMO the same thing as ATF? Smells and looks the same. I put a splash of cheap ATF in all my lawnmowers a few times a season. Never had issues with these little flatheads since doing this.
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Old 10-15-2020, 08:43 AM   #12
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Default Re: Marvel Classic Motor Oil

Tim, not sure it is the same, but it is most likely similar. It is not magic, it is just a lubricant.
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Old 10-15-2020, 08:48 AM   #13
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Default Re: Marvel Classic Motor Oil

I believe MMO has its roots as a sewing machine oil, but not sure. Like others, I add this to fuel (non ethanol) along with some synthetic lead (which I understand is not necessary, but old habits are hard to break).
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Old 10-15-2020, 09:01 AM   #14
Ron Pilger
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Default Re: Marvel Classic Motor Oil

Call me a believer. MMO worked to loosen up stuck valves in a 36 Ford LB engine parked for thirty years. I add 5 ounces at every oil change to my high-mileage 2008 GMC Sierra pick-up and there is a very noticeable difference in valve train noise. I add a couple of capfuls to every small lawn and garden equipment engine, both 2 and 4 cycle. Snowmobiles and Honda minibikes, too. No carb issues, whatsoever.
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Old 10-15-2020, 09:22 AM   #15
tubman
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Default Re: Marvel Classic Motor Oil

I found some Marvel Mystery Oil at the local Dollar General. I looked the bottles over good to make sure it was the real thing and had not passed the expiration date (there was none). I bought all 6 pint bottles they had for $3 each. I used one to add some to the gas and oil in my '51. The original seal was intact. I have run into factory sealed cans of Sea Foam there for the same price in the past.

I wonder what's up?
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Old 10-15-2020, 09:40 AM   #16
Jacques1960
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Default Re: Marvel Classic Motor Oil

Seafoam - now there's a product that can bring even a two stroke outboard back from the dead
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Old 10-15-2020, 09:59 AM   #17
Charlie ny
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Default Re: Marvel Classic Motor Oil

MMO not magic ? I have some really old MMO my dad bought a long time ago....he passed in '56....A tin can of it and a glass bottle of it. The magic in this case is he touched the containers. Dad explained MMO is very viscous and seeps into places other
lubes cannot......MMO, it's a cult thing I guess.
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Old 10-15-2020, 10:00 AM   #18
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Default Re: Marvel Classic Motor Oil

Quote:
Originally Posted by tubman View Post
I found some Marvel Mystery Oil at the local Dollar General. I looked the bottles over good to make sure it was the real thing and had not passed the expiration date (there was none). I bought all 6 pint bottles they had for $3 each. I used one to add some to the gas and oil in my '51. The original seal was intact. I have run into factory sealed cans of Sea Foam there for the same price in the past.

I wonder what's up?
Walmart has it in 1 gal. containers for $15.87, that's about 33% less than $3 per pint.
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Old 10-15-2020, 10:25 AM   #19
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Default Re: Marvel Classic Motor Oil

Quote:
Originally Posted by Charlie ny View Post
MMO not magic ? I have some really old MMO my dad bought a long time ago....he passed in '56....A tin can of it and a glass bottle of it. The magic in this case is he touched the containers. Dad explained MMO is very viscous and seeps into places other
lubes cannot......MMO, it's a cult thing I guess.
Charlie ny
Very good explanation! I guess it is magic!!!
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Old 10-15-2020, 10:39 AM   #20
Krylon32
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Default Re: Marvel Classic Motor Oil

Back in the old days when I farmed we had several propane irrigation engines and they all had MMO overhead oilers that were vacuum operated and injected MMO into the propane that we kept full of MMO to stop sticky valves. Seemed to work?
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