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Old 10-25-2011, 08:45 AM   #1 (permalink)
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Marvin's Mystery Oil...Anyone use it?

Marvin's Mystery Oil...Anyone use it? I came acrossed an unopened quart of it in by garage. It says to use it in the crankcase oil, trans and fuel, both gas and diesel.

The product has been around forever...so I was wondering if there are really any benifits?

The Mog is running just fine. I do have a 79 CJ-5 w/258 I-6 and ton-o-miles, the valves get pretty noisy once she warms up, the can says it can fix it!?!

Anyone have any horror stories and rave reviews?

Thanks,

Brian Heuschkel
1975 - 416
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Old 10-25-2011, 08:51 AM   #2 (permalink)
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I stay away from "Mechanic in a can" products. Anything that universal, that you can use in every tank, container, and fluid, one has to wonder if it does anything at all. Just my opinion though.
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Old 10-25-2011, 08:55 AM   #3 (permalink)
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brian, are you refering to marvel mystery oil? if so, i have used it for years with good results as a fuel additive in older light airplane engines that were designed for leaded fuel, and now are running on unleaded auto gas or lowlead avgas. it seems to help lube the valve guides, i also think used in the crankcase it would help keep rings from sticking. i know guys who race warbirds at reno who use it in the fuel also. cheers, kris
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Old 10-25-2011, 09:21 AM   #4 (permalink)
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Yes, Marvel Mystery Oil

Yes, Marvel Mystery Oil.
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Old 10-25-2011, 09:28 AM   #5 (permalink)
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My mistake, I thought it was like this stuff

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Old 10-25-2011, 09:52 AM   #6 (permalink)
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My mistake, I thought it was like this stuff

Restores compression by magically rebuilding your rings and valve seats ... seems legit
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Old 10-25-2011, 09:55 AM   #7 (permalink)
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Yeah, same with that "motor honey" and products like that.

I use Kleen Flo as my additive in my U1300L with great results, I didn't realize this mystery stuff was an additive like that.
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Old 10-25-2011, 09:57 AM   #8 (permalink)
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Yeah, same with that "motor honey" and products like that.

I use Kleen Flo as my additive in my U1300L with great results, I didn't realize this mystery stuff was an additive like that.
I'm guessing if you have really bad carbon build up, you could loose compression by having bad valve seats, but I don't think adding anything to the oil would fix that. Maybe a gas additive might ... maybe. If you have bad rings, nothing but a ring job will fix that.

I add the STP stuff to my Ford's oil each oil change. Seems to help, but maybe it's all in my head (just like motor honey).

According to this amazon review, they tested STP and Slick50 in cabs and found no difference ... so like I said ... probably in my head.

http://www.amazon.com/STP-Oil-Treatment-15-oz/dp/B0002JN2KO

Last edited by kschlege; 10-25-2011 at 10:10 AM.
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Old 10-25-2011, 12:27 PM   #9 (permalink)
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I have used a boat load of this stuff freeing up stuck gas engines in old International tractors, such as the "b", "C" and "M" series. Pull the plugs out, pour it in and let it sit for a week or so. If it still wouldn't turn over with the hand crank, we pulled the head and tapped a high piston back down with a block of wood, bolted back together and sent em down the road. I can't say I ever saw it or added it as a solution to a running motor, but it sure was good for loosening up stuck things if you had the time. MUD
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Old 10-25-2011, 12:43 PM   #10 (permalink)
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IMO, better quality snake oil.

You can free up stuck things, and lubricate noisy things with better dedicated products. There is no one product fixes everything, helps everything, again IMO.

Injector cleaner for the injectors. Good oil and frequent changes. Etc..
A worn engine is making noise to tell you it's time to do something.

As a side note, I drove a 380SL from philly to AZ, then San Fran, Washington, Chicago and back. It had a horrible rod knock before we started. Filled it with Mobile 1 on our way out and ran nice and smooth the whole way. Note: The knock was LOUD. My only guess is that the synthetic cleared some crud out of the system. Not that I endorse Mobile 1, it's just a story after all. But I still wonder why it had the effect that it did.
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