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  1. #1

    Join Date
    Aug 2011
    Location
    FA40
    Posts
    767

    What's your experience?

    Marvel Mystery Oil + avgas = ?????

    a. solution for sticky valves
    b. trouble
    c. neither problem nor solution
    d. other

  2. #2
    CarlOrton's Avatar
    Join Date
    Jul 2011
    Location
    DFW Area
    Posts
    729
    a

    Carl Orton
    Sonex #1170 / Zenith 750 Cruzer
    http://mykitlog.com/corton

  3. #3
    rwanttaja's Avatar
    Join Date
    Jul 2011
    Location
    Seattle
    Posts
    2,948
    Eons ago, I had a crusty old A&P who had gotten his start working on Constellation and DC-6es. He told me to use Marvel Mystery Oil to prevent my valves from sticking.

    Haven't had a sticky valve in 30+ years of C-85 operation. So mark me with an "A" as well.

    Also works great as an elephant repellent. Since I started using it, I haven't had a single elephant in my hangar.

    "B" can be valid, if you use too much of it. ISTR an NTSB report where the plane's oil tank was half MMO.....

    Ron Wanttaja

  4. #4

    Join Date
    Nov 2012
    Posts
    1,609
    I was told years or decades ago aviators purchased this stuff in 55 gallon drums. There must have been a reason they used this. It's a shame this reason died with these aviators. Why we need to share all we know so we can pass this down to the next generation and not make them learn all this over again.

    Tony

  5. #5

    Join Date
    Aug 2011
    Location
    Wachapreague Va.
    Posts
    247
    I know a crop duster who uses it in his big old radial engine daily and has for many years. He and his mechnanic swear by it. His engines usually run a long time with few problems. Never a stuck valve. He has been at it for over 30 years.

  6. #6

    Join Date
    Jun 2012
    Location
    Missouri
    Posts
    44
    At one point, Steve Bennett, formerly Great Plains Aircraft Engines, told me to use 25 % Marvel Mystery Oil with my 30 W oil in the VW.
    Jerry Folkerts

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