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Grey cream in my oil tank

in 912 / 914 Technical Questions 7 years ago

  • Re: Grey cream in my oil tank

    by » 7 years ago

    OK, so I understand that is probadly lead, or even water and I should not worry to much about that.
    I will maintain the oil chage frequency every 50 hours, even if now I only use unleaded SP98, and next time I will open/clean my oil tank to check if I still find this grey cream.
    Thanks folks.
      
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  • Re: Grey cream in my oil tank

    by » 7 years ago

    OK, I finally was able to view the photos.
    And I agree it may not be water.
    Watery Oil would soak into the paper towel and spread.
    The grey Paste looks and acts a lot like Anit-Seize Compound which is finely ground aluminium in oil.
    This very well could be fine lead precipitate in the oil.
    If you still have any of the Goo, place a drop in a jar of water.
    Watery Oil will Float, Oily Lead will sink.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: Grey cream in my oil tank

    by » 7 years ago

    Given 24 hours to think about the problem....

    The engine has not seen Leaded gas in over, let's call it, 700+ hours to be conservative.
    That looks like a lot of lead to me.

    With the Anti-Seize compound still in mind, I am questioning if it might be Aluminum!!!!

    Now, I am not sleeping so well!
    Engine Oil can be tested for under $20.
    It may be advisable to send an oil sample out for Analysis.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: Grey cream in my oil tank

    by » 7 years ago

    Hi Bill,
    Last April, I have done an oil analysis:

    It was approx 60 hours motor ago, and between I have made an oil change 50 hours motor ago (means 10 hours after this analysis).

    To be noticed that for this last oil change, I warm up the motor during approx 10 min but I did not fly before (which is usually what I do); So, may be this time the deposit (grey cream) stay at the bottom of the oil tank?
      
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  • Re: Grey cream in my oil tank

    by » 7 years ago

    Here's what happens when oil doesn't get changed and water never gets cooked off.

    https://www.youtube.com/edit?o=U&video_id=gxUWvlAPYZk

    https://www.youtube.com/edit?o=U&video_id=DrjW3rnERGA

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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