Re: Marvel Mystery Oil Actually Works!
[Re: srt]
#2891498
02/21/21 02:23 PM
02/21/21 02:23 PM
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Joined: Sep 2003
Posts: 19,479 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,479
north of coder
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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.
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Re: Marvel Mystery Oil Actually Works!
[Re: srt]
#2891610
02/21/21 07:13 PM
02/21/21 07:13 PM
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Joined: Jan 2011
Posts: 15,900 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,900
Central Florida
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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.
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Re: Marvel Mystery Oil Actually Works!
[Re: larrymopar360]
#2891730
02/22/21 01:04 AM
02/22/21 01:04 AM
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Joined: Feb 2021
Posts: 157 PINE VALLEY
Ray S
member
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member
Joined: Feb 2021
Posts: 157
PINE VALLEY
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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
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Joined: Jan 2003
Posts: 15,800 Jefferson State
srt
ESYC
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ESYC
Joined: Jan 2003
Posts: 15,800
Jefferson State
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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)..
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Re: Marvel Mystery Oil Actually Works!
[Re: srt]
#2892337
02/23/21 04:08 PM
02/23/21 04:08 PM
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Joined: Jan 2011
Posts: 15,900 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,900
Central Florida
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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.
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Re: Marvel Mystery Oil Actually Works!
[Re: fc7_plumcrazy]
#2892775
02/24/21 05:26 PM
02/24/21 05:26 PM
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Joined: Jan 2011
Posts: 15,900 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,900
Central Florida
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I'm yet to read instructions on bottle of MMO. Does it instruct to leave-in or dump?
Facts are stubborn things.
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Re: Marvel Mystery Oil Actually Works!
[Re: cudaman1969]
#2893631
02/27/21 10:38 AM
02/27/21 10:38 AM
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Joined: Jan 2018
Posts: 203 Alabama
David1971
enthusiast
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enthusiast
Joined: Jan 2018
Posts: 203
Alabama
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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.
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Re: Marvel Mystery Oil Actually Works!
[Re: David1971]
#2894261
03/01/21 02:18 AM
03/01/21 02:18 AM
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Joined: Feb 2021
Posts: 157 PINE VALLEY
Ray S
member
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member
Joined: Feb 2021
Posts: 157
PINE VALLEY
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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.
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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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Joined: Feb 2014
Posts: 1,709 central il.
second 70
top fuel
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top fuel
Joined: Feb 2014
Posts: 1,709
central il.
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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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