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Old 05-17-2006, 01:17 PM
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marvel mystery oil

does anyone know if marvel mystery oil could hurt an older (73) engine?

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Old 05-17-2006, 01:21 PM
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Since it has been around from the early 20's or so, probably not. I still use it on occasion for various tasks. It was good for loosening up hydraulic lifters, but the only possible bad spot is if it lossens up any sludge in the engine and lets it get into the oil pick-up. That could cause the pick up to become clogged and a loss of oil pressure.
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Old 05-17-2006, 01:58 PM
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Quote:
Originally Posted by mrobby440
does anyone know if marvel mystery oil could hurt an older (73) engine?
depends on why you feel the need to run it in the motor. If it is to loosen it up, sticking lifters, etc, i cant see the harm in it. if the motor has a lot of sludge in it..i think i would use trans fluid to flush it. Once again, the question remains...why do you wnat to add the marvel??
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Old 05-17-2006, 02:22 PM
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It's great for air tools, but has very limited use in the engine.

Vince
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Old 05-17-2006, 08:44 PM
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I put a quart in my '79 engine (Chevy 350) last year, and it didn't seem to hurt anything. I can't say for sure if it helped anything, but it still runs as well as it ever did. (knocking on wood)
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Old 05-17-2006, 09:39 PM
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Flush engine with tranny fluid? That sounds like fun. Do you just pull out the plug and run a few quarts through the engine, then fill'er up with normal oil? Or is there a way to flush the tranny fluid out, after?

~65

(I've never heard of this...)
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Old 05-17-2006, 10:53 PM
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Quote:
Originally Posted by 65Stanger
Flush engine with tranny fluid? That sounds like fun. Do you just pull out the plug and run a few quarts through the engine, then fill'er up with normal oil? Or is there a way to flush the tranny fluid out, after?

~65

(I've never heard of this...)
I've never done it but I know people who have. They just filled the crankcase with X amount of tranny fluid, ran the engine for a while, drained it then filled it back up with regular engine oil. I've also heard of people dumping a quart into the gas tank before fill ups on occasion. I've never done this either but the people that have say it helps clean out the fuel system...
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Old 05-17-2006, 11:56 PM
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Quote:
Originally Posted by Blazin72
I've also heard of people dumping a quart into the gas tank before fill ups on occasion.
A quarts a bit much, a couple tablespoons will do the trick. As for the engine flushing I've been told to add a quart, idle for 15-20 mins then change as normal.
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Old 05-18-2006, 01:06 AM
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People,
On older cars, pre catalytic converters, running marvel oil in the gasoline helped oil the top of the cylinders. Putting it in the crankcase helped keep the inside of the engine clean. Remember back in the GOOD ol days we only had non-detergent oil so the inside of the engine could get kind of GUNKY.
Doing the trans fluid was a one time thing. You just bought a car and you "flushed the engine". Put in one quart of trans type "A" oil and run the engine for fifteen to twenty minutes. Then change the filter and change the oil. Then drive with the new oil for one or two days and then change the filter again and add one quart of the new oil. Did it work? I don't know we never took the engine apart to see if had been "flushed" clean.
For sticky lifters I used diesel fuel. Maybe a cup in the crankcase and run the engine. Then change the oil and filter. If the lifter did not stop ticking then you had to take the engine apart and replace the lifters.
I do not think doing these things now-a-days would do your emission systems any good. I know the O2 sensors would be killed if you did these things.

Have Fun
Scholman
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Old 05-18-2006, 01:49 AM
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Marvel Mystery Oil is basically a viscosity modifier. Its not magic. Many older engines exhibit problems associated with excessive wear; things that would be masked by a thicker oil. MMO does just that... it masks wear.

It does the same basic thing as switching to a thicker oil.
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Old 05-18-2006, 01:59 AM
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65stanger,
your engine was just re-built, it is totally clean,
do not flush it with a qt of tranny fluid.....the oil your using has correct cleaning agents in it...

ATF flush (and to a degree Marvel Mystery Oil) applied best to a motor that never sees more than about 1500rpm like a NYC Manhatten taxi cab,
2oz down the carb to bust loose the built up carbon in the heads,
a flush to remove the "baked on" sludge that might make a lifter stick

mrobby, "if it ain't broke don't fix it...to make it broke"

Last edited by red65mustang; 05-18-2006 at 02:06 AM.
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Old 05-18-2006, 05:03 AM
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Quote:
Originally Posted by 302/Z28
It's great for air tools, but has very limited use in the engine.

Vince
I don't put it IN my engine but it's great for soaking internal engine parts that you plan to reuse. I have a set of factory hydraulic roller lifters soaking in some right now. Gets them nice and clean and it's great penetrating oil. After they're spotless I'll soak them in 30W oil until I'm ready to use them.

I did the 1 Qt of ATF engine flush back in the day to squeeze a few more months out of some of my beaters. Even the detergent oils back then weren't all that great. The ATF "helped" but it was a short term band aid. Today it's a very different story, the oil we have now is much better. Unless you yanked some relic out of a field somewhere and just want to try to make it turn over I see no reason to put MMO in your engine. On the other hand I wouldn't be without the stuff but for other uses.
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Old 05-18-2006, 05:11 AM
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[QUOTE=curtis73]Marvel Mystery Oil is basically a viscosity modifier. QUOTE]

No it isn't, it's fairly thin, almost like 10W oil. I have heard that it contains wintergreen oil and that is what the distinctive smell is.

Vince
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Old 05-20-2006, 01:10 PM
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Quote:
Originally Posted by curtis73
Marvel Mystery Oil is basically a viscosity modifier. Its not magic. Many older engines exhibit problems associated with excessive wear; things that would be masked by a thicker oil. MMO does just that... it masks wear.

It does the same basic thing as switching to a thicker oil.
MMO does not thicken oil, it actually thins it....

It does loosen sticky valves and lifters......

And I have seen a couple people who swore by it religiously 20 years ago, and added at every oil change, ,,,,,, and guess who both got flat cam lobes...
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Old 05-20-2006, 11:12 PM
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You're right... I was thinking about Motor Hunny. Sorry.
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