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Re: Marvel Mystery Oil Actually Works! [Re: srt] #2891498
02/21/21 02:23 PM
02/21/21 02:23 PM
Joined: Sep 2003
Posts: 14,882
north of coder
moparx Offline
"Butt Crack Bob"
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north of coder
over the years, i have used ATF in several gunked up engines to clean them up.
also at oil change time, dump a quart of diesel in the mix, run for a bit, then drain.
marvel works good for soaking steel bolts that are stuck in aluminum castings. think penetrating oil.
beer

Re: Marvel Mystery Oil Actually Works! [Re: srt] #2891610
02/21/21 07:13 PM
02/21/21 07:13 PM
Joined: Jan 2011
Posts: 9,321
Central Florida
larrymopar360 Offline
I'm tired...Very tired.
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Central Florida
Originally Posted by srt
Pilots and aviation mechanics (A&P) use it frequently for it's ability to dislodge glaze from cylinders and heads. Remember aircraft are air cooled and meticulously maintained (should be at least).
The stuff is basically a lot of mineral oil and some mineral spirits with a little bit of benzene solvents to cut oil that becomes plasticized from high heat (think outside cast iron skille)t.
Anyplace you see that crusty black stuff or amber colored buildup n parts when disassembling an engine will be cleaner if you use this stuff in oil and fuel. Using it one needs to stay up on oil change intervals and filter changes. If used on old engines checking the oil pickup screen is a good idea. I recall seeing "experienced" engines that died of oil starvation after the stuff was used and the pickup was plugged solid. Regardless wearing surfaces generally stay clean (cam lobes and lifters, cyl walls, bearings) and the area around ring lands do stay clean.
If using synthetic the best I method I recall was to put it in about 1,000 mi before a filter change, repeat every change.

My gut feeling is the benzene solvents really do the work and the mineral oil and spirits thin and mix with the oil to get the solvents into the lube circuits and carry the crud away to the oil filter.
Which reminds me use high quality filters so as to trap the crud.
I'd dump a quart in if I can catch it shortly before an oil change. I just have to catch it at right time. Fleet guy probably won't do it. IDC, I will. I haven't seen what filters they use, but I'm betting el cheapo.

I remember as a kid, my dad pouring small amounts of ATF down carb of slant six, keeping idle up, and telling me it cleaned valves IIRC.


Facts are stubborn things.
Re: Marvel Mystery Oil Actually Works! [Re: larrymopar360] #2891730
02/22/21 01:04 AM
02/22/21 01:04 AM
Joined: Feb 2021
Posts: 72
PINE VALLEY
Ray S Offline
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PINE VALLEY
Originally Posted by larrymopar360


I remember as a kid, my dad pouring small amounts of ATF down carb of slant six, keeping idle up, and telling me it cleaned valves IIRC.


When I first got the RV with 413 it hadn't run in years, I put in 6 qt of cheap oil and did a lot of cleaning:
MMO in the intake when hot, and oil, and gas, and every time I shut it down hot I'd flood it with Seafoam then shut it off to cook clean.
After 2 bottles of Seafoam and a lot of MMO it idled smooth, and I put a snake cam down the intake and in a spark plug hole to look; the intake had NO carbon left and the piston tops shined.

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Re: Marvel Mystery Oil Actually Works! [Re: larrymopar360] #2891734
02/22/21 01:30 AM
02/22/21 01:30 AM
Joined: Jan 2003
Posts: 12,907
Whoa-is-mia
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srt Online content
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Originally Posted by larrymopar360
I'd dump a quart in if I can catch it shortly before an oil change. I just have to catch it at right time. Fleet guy probably won't do it. IDC, I will. I haven't seen what filters they use, but I'm betting el cheapo.

I remember as a kid, my dad pouring small amounts of ATF down carb of slant six, keeping idle up, and telling me it cleaned valves IIRC.


Brings back memories. As a kid I worked at an gas station where we serviced vehicles regularly. The owner had mix in a oil can of marvel 50% gas 25% and Diesel 25%, or thereabout by eyeball. He had a quart or so mixed up all the time. On crappy running cars we'd put some in a half pint or so plastic bottle with a hole drilled in the cap and squirt that down carb of a running engine about 2,500 rpm "to free up the rings" couldn't do it too fast or engine would stall. Thing was it made plumes of smoke. He had me always call the fire dept before doing a car as there was a lady on the back street that would sometimes call in a fire at the gas station. Poor old lady feared that someday the block would burn down because of the gasoline tanks (underground)..



Re: Marvel Mystery Oil Actually Works! [Re: srt] #2892337
02/23/21 04:08 PM
02/23/21 04:08 PM
Joined: Jan 2011
Posts: 9,321
Central Florida
larrymopar360 Offline
I'm tired...Very tired.
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I'm tired...Very tired.

Joined: Jan 2011
Posts: 9,321
Central Florida
Originally Posted by srt
Originally Posted by larrymopar360
I'd dump a quart in if I can catch it shortly before an oil change. I just have to catch it at right time. Fleet guy probably won't do it. IDC, I will. I haven't seen what filters they use, but I'm betting el cheapo.

I remember as a kid, my dad pouring small amounts of ATF down carb of slant six, keeping idle up, and telling me it cleaned valves IIRC.


Brings back memories. As a kid I worked at an gas station where we serviced vehicles regularly. The owner had mix in a oil can of marvel 50% gas 25% and Diesel 25%, or thereabout by eyeball. He had a quart or so mixed up all the time. On crappy running cars we'd put some in a half pint or so plastic bottle with a hole drilled in the cap and squirt that down carb of a running engine about 2,500 rpm "to free up the rings" couldn't do it too fast or engine would stall. Thing was it made plumes of smoke. He had me always call the fire dept before doing a car as there was a lady on the back street that would sometimes call in a fire at the gas station. Poor old lady feared that someday the block would burn down because of the gasoline tanks (underground)..
Haha yep I remember tons of smoke when my dad did the ATF down the carb.

Seafoam is the other product that I've only heard good things about.

Ray S, those are amazing results!



Facts are stubborn things.
Re: Marvel Mystery Oil Actually Works! [Re: larrymopar360] #2892350
02/23/21 04:30 PM
02/23/21 04:30 PM
Joined: Oct 2006
Posts: 5,359
Germany
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fc7_plumcrazy Offline
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Germany
I have used MMO, too for a ticking lifter. It went quiet after that, too.
It was a year ago and I only drove around 300 miles since.

Should an oilchange be done soon?

Carsten

Re: Marvel Mystery Oil Actually Works! [Re: fc7_plumcrazy] #2892775
02/24/21 05:26 PM
02/24/21 05:26 PM
Joined: Jan 2011
Posts: 9,321
Central Florida
larrymopar360 Offline
I'm tired...Very tired.
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Posts: 9,321
Central Florida
I'm yet to read instructions on bottle of MMO. Does it instruct to leave-in or dump?


Facts are stubborn things.
Re: Marvel Mystery Oil Actually Works! [Re: larrymopar360] #2892794
02/24/21 05:59 PM
02/24/21 05:59 PM
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Posts: 3,660
MO
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cdp Offline
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MO
My current project isn't a Mopar, but a 1951 Chevy Truck 3100 w/216 inline-6 and 3-speed that's been sitting outside for over 30 years on an old farm in east Kansas. Put MMO in cylinders that were stuck. 2 weeks later, I was able to break them free. Found valves/lifters stuck open. Gain, squirted with MMO & PB blaster, a few hand cranks and a small rubber mallet, they are now all moving freely. Plan on firing the motor over this next weekend.

Another farmer trick is transmission fluid and diesel mixed together for penetrating fluid. We had a stuck Model-A John Deere and it freed after sitting a month with the cylinders filled with it.

20210220_094904.jpg
Re: Marvel Mystery Oil Actually Works! [Re: cdp] #2892843
02/24/21 08:20 PM
02/24/21 08:20 PM
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Posts: 5,641
fredericksburg,va
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cudaman1969 Offline
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Used atf for over 50 years, just remember it’s cleaning the crud out and this stuff is mixed in the oil and the bottom of pan so drain it out. This thin oil works like soap,

Re: Marvel Mystery Oil Actually Works! [Re: cudaman1969] #2893631
02/27/21 10:38 AM
02/27/21 10:38 AM
Joined: Jan 2018
Posts: 166
Alabama
David1971 Offline
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Alabama
When added to the crankcase, will Marvel cause seals to leak in a high mileage engine that has previously not leaked? I have always been told never to switch from conventional oil to synthetic for that reason.

Sorry to stray off topic a bit, but has anyone had experience with Rislone Engine Treatment? Is it more aggressive than Marvel?

Thanks,
David

Last edited by David1971; 02/27/21 08:32 PM.
Re: Marvel Mystery Oil Actually Works! [Re: David1971] #2894261
03/01/21 02:18 AM
03/01/21 02:18 AM
Joined: Feb 2021
Posts: 72
PINE VALLEY
Ray S Offline
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PINE VALLEY
Originally Posted by David1971
When added to the crankcase, will Marvel cause seals to leak in a high mileage engine that has previously not leaked? I have always been told never to switch from conventional oil to synthetic for that reason.

Sorry to stray off topic a bit, but has anyone had experience with Rislone Engine Treatment? Is it more aggressive than Marvel?

Thanks,
David

I think Rislone is essentially kerosene. I have also poured kerosene in an engine after draining the oil and putting the plug back, then let it dissolve the sludge.
But in my 413 I had dropped the pan and cleaned it anyway.

Re: Marvel Mystery Oil Actually Works! [Re: Ray S] #2894359
03/01/21 12:38 PM
03/01/21 12:38 PM
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Posts: 1,312
central il.
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second 70 Offline
pro stock
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central il.
Originally Posted by Ray S
Originally Posted by David1971
When added to the crankcase, will Marvel cause seals to leak in a high mileage engine that has previously not leaked? I have always been told never to switch from conventional oil to synthetic for that reason.

Sorry to stray off topic a bit, but has anyone had experience with Rislone Engine Treatment? Is it more aggressive than Marvel?

Thanks,
David

I think Rislone is essentially kerosene. I have also poured kerosene in an engine after draining the oil and putting the plug back, then let it dissolve the sludge.
But in my 413 I had dropped the pan and cleaned it anyway.


My Dad used the old trick of adding a quart of kerosene to crankcase everytime he changed oil. Put it in run it at idle until warm drain oil and filter.

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