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Thread: Marvel Mystery Oil?

  1. #71
    rwanttaja's Avatar
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    Jul 2011
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    Seattle
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    The A&P who did the annual on our old club Fly Baby started out as a mechanic on Northwest Airlines Constellations. He told me to use MMO on my Fly Baby's Continental to help forestall valve problems. And I have, for the past 30+ years.

    Oh, and it has kept the hangar clear of elephants, too.

    I posted a story of my old A&P to the Fly Baby web page:

    http://www.bowersflybaby.com/stories/legacy.html

    Ron Wanttaja

  2. #72
    Quote Originally Posted by COMM114 View Post
    This much is true: MMO is not an approved additive for fuel or engine oil in any type of certificated aircraft engine. Period.
    Actually, Kinner service bulletin #130 recommends the application of Marvel-Oil as a valve stem lubricant to extend the life of valves guides.

    Best,


    HT & V


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  3. #73
    Desert185's Avatar
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    Feb 2019
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    Nevada
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    I added some to the crankcase of an old Dodge pickup in storage at another state. The engine would run, but not pull a load. I suspected lifter problems after troubleshooting the ignition system. After 20 minutes at a high idle, the truck ran like a top. The solvent will eventually burn off leaving only the engine oil. Normally, I don’t use it, but i always have some onhand for those times of need.

    I’ve also had a friend use it in an IO-520 with a noisy lifter. Cured the issue.

  4. #74
    Aaron Novak's Avatar
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    Aug 2011
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    Oshkosh, Wi
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    Quote Originally Posted by high time cub View Post
    Actually, Kinner service bulletin #130 recommends the application of Marvel-Oil as a valve stem lubricant to extend the life of valves guides.

    Best,


    HT & V


    Not only Kinner. Technical bulletins from American Cirrus and Continental ( for the A-40 ) suggest the same thing.

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