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post #31 of Old 04-30-2013
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Re: Marvels Mystery Oil

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Isn't some form of fuel lubricant needed for A-4's built before lead free gas was introduced and does Marvel Mystery Oil perform that function?
Go here: Find ethanol free gas near you! and see if you can get ethanol free gas in your area.

Been no lead from December 31, 1995 SO 18 years now with no big A4 problems

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post #32 of Old 04-30-2013
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Re: Marvels Mystery Oil

One of the things I discovered when I had a 1978 A4 was that when I wasn't using Marvel Mystery Oil my compression was more than 1/3rd less than it should have been. The engine was difficult to start, especially in cold weather, and the plugs seemed to foul easily.

Using the oil, mixed with the fuel, the compression improved dramatically, which I believe was the result of the valves seating better. The engine started immediately, took just a few seconds to smooth out, got better fuel economy, and after six months of running nearly every day, the plugs looked like new.

Now, from my perspective, Marvel Mystery Oil is the best thing since sliced bread for the A4, and I will continue to use it as long as I have a boat powered with an A4. I love the engine, and have absolutely no fears running a gasoline engine in any type of boat, sail or power.

My current A4 was installed as a re-manufactured engine in 2000, it has a bit of blow by, but that's something I can easily address with a kit. The compression is good, and I suspect the blow by is from worn valve guides and seals. I put hundreds of hours on the engine during my recent trip to Marathon, FL and back to the Chesapeake's upper reaches. I fired it up on Saturday and it started instantly, despite the chilly weather.

I'll stick with the oil, and I highly recommend it to anyone who has an A4, or any other engine, for that matter. It sure works for me.

Gary
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post #33 of Old 04-30-2013
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Re: Marvels Mystery Oil

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you're the best. Thanks again Jon. Had builder put fitting for filter in return. ?was that a mistake. Would it be better if bypass filter was place just before low pressure pump ?
Sorry, but I'm not understanding your question... Unless you already have a remotely mounted oil filter, not sure what you mean by the "return"...

You're not thinking of the FUEL system, by any chance, are you?
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post #34 of Old 05-01-2013
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Re: Marvels Mystery Oil

So,just how much mystery oil do you add to ten gal. tank.I have a 1967 a-4 that runs good but I would like to try this. Thanks
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post #35 of Old 05-01-2013
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Re: Marvels Mystery Oil

2 ounces per 10 gallons of gasoline. And, if you decide to add to an oil change as well, 1 quart for every three quarts.

Gary
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post #36 of Old 05-01-2013
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Re: Marvels Mystery Oil

have filter in return of fuel ( should serve to "polish") but also two filters on oil return ( believe from oil pan and just before pump) . Believe one (first) is 10 micron then (second) is 4 micron . Will be on boat May 21 so will check details. Probably was premature to have troubled you without details in hand. My apologies.

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post #37 of Old 05-01-2013
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Re: Marvels Mystery Oil

I would use Stabil or similar if you intention is to stabilise Ethanol gasoline.

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post #38 of Old 05-01-2013
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Re: Marvels Mystery Oil

We used to use Marvel Mystery Oil in our gasoline engines on the farm. A lot of equipment is seasonal use so it may sit for several months between uses. When the valves started to stick in one of the many old side valve engines on the various pieces of powered equipment, we would add a few ounces to the tank and then with a squirt can, squirt MMO into the intake of the running engine. This would often free up stuck valves and let the engine run well in just a few minutes. During the oil spray treatment, the smoke was terrible if pretty smelling.

An Atomic 4 is just another old side valve flat head gas engine. Not a reason in the world for it not to work there just as well as it did in every thing else.

We even used it in 2cycle engines, including outboard motors, that were low on compression and hard to start. Squirt some in the intake, crank it a few times and then let it set for a few hours. It would cut the crud that was causing the piston rings to stick and get them going as well. We used MMO and a lot of ether to get stuff going. Once it was going, the MMO helped keep it going.

I was told that MMO had cinnamon oil and oil of cloves in it. Don't really know. We also used it for penetrating oil. It worked better than some of the stuff that was sold as penetrating oil.

Last edited by OPossumTX; 05-01-2013 at 06:44 PM. Reason: to hear the keys rattle.
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Re: Marvels Mystery Oil



I just finished my biannual spark-plugs and water-pump impellers and i got four nice tan spotless clean spark-plugs i attribute a lot of it freshwater cooling because the 180 thermostat lets the motor burn so much cleaner

Gary there are no seals just valve guides so any blow-by is ring or valve related and a leakdown test would tell in a few minutes

Another performance issue comes form raw-water cooling because and amazing amount of stuff builds up in the valve passages below the valves because its so COLD to the point its surprising the motor can run

You cant even see the gunk without pulling a good bit of the motor apart

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post #40 of Old 05-01-2013
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Re: Marvels Mystery Oil

I figure it's either guides or rings, but either way, I think I'll construct a kind of a PCV system and send the blowby through the carb's flame arrestor - just to keep it out of the cabin. It's not a lot, but enough to be somewhat annoying.

Cheers,

Gary
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