That's the 'Mystery.' :-) For a 1950's era product that looks for all the world like 'tune up in a can' Marvel Mystery Oil is remarkably effective at keeping valve trains in training.
I first ran across it in the 80's, when leaded gas went away and I had a Universal Atomic 4 boat engine that really liked lead. Consensus was that people who ran Marvel in the gas were fine. Those who didn't regularly got stuck and/or burned exhaust valves. Those who ran 'lead substitutes' didn't do as well as those of us just ran the Marvel. I have no idea how it gets to the right place to do what it does, other than some vague hand-waving about 'capillary attraction.' But, since pulling the head off the engine while hanging upside down, and then pounding on the valves in between smelling fuel and puking into the bilge really sucks, we tended to go with what we didn't understand, and be thankful. Greg At 02:32 PM 12/18/98 -0800, Steve Dold wrote: >At 09:00 AM 12/18/98 -0800, you wrote: >>100LL and want to eliminate the probability of valve sticking...add 4 >>ounces of Marvel Mystery Oil to each wing tank on a fill-up, plus a quart >>of it in the oil during the oil change. It does a great job of keeping that >>top end clean. >> > >How does adding it to the gas help the top end? Where does it lubricate? > >As far as I know, oil flows from the rocker box down through the intake >valve guide, not the other way. Is it supposed to lubricate the exhaust >valve stems? > > > >---------------------------------------------------------------- >Steve Dold ([EMAIL PROTECTED]) http://home.pacbell.net/sdold/ >Say NO to useless over-quoting >---------------------------------------------------------------- > >
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