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Thread: Molykote in Conti C90

  1. #1

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    Molykote in Conti C90

    Hey Guys...any experience using molikote anti friction additive in Continental engines? Would it be a good choice to protect the engine during cold start? And would it be of any benefit when it comes to sticky valves? Is it OK to use it with lubricants like AeroShell W100?

  2. #2
    Aaron Novak's Avatar
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    Aug 2011
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    I would not for a few reasons:

    1-It settles out and likes to plug oil galleries, sprayers and screens.
    2-It will short out spark plugs.
    3-It tends to fill the hone finish of the cylinder and actually starve the rings of oil.
    4-It wont stop valve sticking
    5-It acts as a catalyst for galvanic corrosion

    Need I go on?

  3. #3

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    No need to...you've been very graphic :-) thanx

  4. #4
    Mike Berg's Avatar
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    I never found any need to use extra additives. I've used Phillips 20/50 XC in both my Cherokee when I owned it for 25 years and 1400 hours, my 65 horse Champ and my 0200 Champ with basically zero engine problems including no sticking valves. Why put something in that changes the additive package already blended into the oil? A "multi weight" (20/50 or 15/50) is a good choice for cold starting in my humble opinion.
    If God had intended man to fly He would have given us more money!

  5. #5

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    Thanks for your words. I've been thinking about using multi viscosity oil...and I think I will try it in the next oil change for cold starts this winter.

  6. #6
    Joe Delene's Avatar
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    Depending on where you live and the temps for the start I'd really try to get the engine and oil preheated. I don't have a hard & fast, but down near 45 and below I try to warm things up before cranking. I often use Aeroshell 100+ in the Summer and use a multi grade during the colder months.

    I feel the exact oil make and type is only one factor in the mix. The overall care and operation of the engine with timely oil changes all contribute to longevity. JMHO.

  7. #7

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    Thanks. Here in Argentina the temperatures usually aren't too cold and the airplane is hangared...I think multigrade would do the trick. Also, my plane wasn't being flown too much before I bough it. It seems that the engine is happier now with the more continuous use...the first flights I did I had some problems with lifters and valves but the last two days were a non event concerning engine issues...

  8. #8
    Joe Delene's Avatar
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    Yes, sounds warmer down there. I generally fly at least 30 minutes every two weeks, as a minimum.

  9. #9

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    This one is gonna fly much more, hopefully. My partner and I are in the process of accumulating hours for the coming licenses...

  10. #10

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