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New motor first oil sample

Discussion in 'General Yachting Discussion' started by 993RSR, Nov 22, 2024.

  1. 993RSR, Nov 22, 2024
    #1
    993RSR

    993RSR Senior Member

    Joined:
    Jan 15, 2004
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    545
    Location:
    Annapolis/ Palm Harbor
    New crate V8 Yanmar installed 1/2022. Combination of inactive and lightly used since then, 84 hours. Recent oil sample showed all levels normal except silicone. Is that normal due to the break-in period, new seals and gaskets?
  2. Capt Ralph, Nov 22, 2024
    #2
    Capt Ralph

    Capt Ralph Senior Member

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    Silicone (silicon dioxide) in your oil comes from 2 common sources.
    Leaching from gaskets, sealants and fittings like you mentioned,
    from the castings and machining of the engine parts also
    Or micro dust in the oil (silica).

    May I recommend checking the cleanliness of the engine's environment, checking the engine's air filter and spot checking the oil in a few hours.
    Not much else to do other than run the engine a lil more often.
  3. Capt J, Nov 22, 2024
    #3
    Capt J

    Capt J Senior Member

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    Silicone is nothing I would worry about. IF you're just changing the oil now, after 2.5 years, it's probably leeched from gaskets or even the o-ring on the oil filter. Oil should be changed annually regardless of hours. Motor should also be run to temp every 2-4 weeks at a minimum.
    d_meister likes this.
  4. 993RSR, Nov 23, 2024
    #4
    993RSR

    993RSR Senior Member

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    Jan 15, 2004
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    Location:
    Annapolis/ Palm Harbor
    In my world maintenance is if it brakes, I'll fix it. Otherwise run it till it stops (which explains needing a repower after 350 hours)
    Thanks for the silicone points
  5. Norseman, Nov 23, 2024
    #5
    Norseman

    Norseman Senior Member

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    Ft. Lauderdale
    I had silicone in every Yanmar oil sample I did, the engine ran fine and every other parameter was perfect.
    Changed oil and filter every 125 hours as per the manual. Good engine, in fact I almost loved it..:cool:
    (So did Mama because it started every time, even in remote anchorages and sometimes in bad weather, single engine boat)
    I often regret selling that boat, but different chapter now.