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  1. #1
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    Synthetic oil, ok or no

    Serial # 3B156607 Model 115ELPT Is it ok to run full synthetic FC-W 4 cycle marine oil in this engine ? If memory serves me right it was ok after Merc came out with a synthetic oil, is that still true ?

  2. Member
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    #2
    merc sell full and semi synthetic so don't see why not??
    2022 z519 cup 225 merc 4s ser # 3B210484. 2--hds12 live units. 2 poles, atlas plate, ghost, hamby's, active target, merc digital gauges
    2002 basscat pantera 3 (dad bought new) sold 8-2-22
    2000 stratos 20 ss (bought new) 200 hp Rude ficht great boat/motor sold 11-21
    pulled by a 2500HD Denali will all the BANKS upgrades
    MAGA 45-47
    ASE/GM Master tech before tools

  3. Member
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    Prosperity,South Carolina
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    #3
    I called them and I'm now using it they said they fully recommended

  4. Member
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    #4
    Thank you, I remembered something about synthetic not being recommended then after Mercury came out with synthetic it was then ok. My owners manual or service manual does not mention "synthetic" anywhere that I could find.

  5. Member
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    Scottsboro AL
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    #5
    no reason not to use it, I remember a couple of years ago Mercury said no full synthetic but then they developed their own and suddenly it was OK lol. that’s what I put in mine last oil change was the 10W-30 Mercury full synthetic.
    2022 Caymas CX 19 / Mercury 225 Pro XS

  6. Member
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    #6
    Quote Originally Posted by Michael333 View Post
    no reason not to use it, I remember a couple of years ago Mercury said no full synthetic but then they developed their own and suddenly it was OK lol. that’s what I put in mine last oil change was the 10W-30 Mercury full synthetic.
    same with lifepo4 batteries ok after they bought a company!
    2022 z519 cup 225 merc 4s ser # 3B210484. 2--hds12 live units. 2 poles, atlas plate, ghost, hamby's, active target, merc digital gauges
    2002 basscat pantera 3 (dad bought new) sold 8-2-22
    2000 stratos 20 ss (bought new) 200 hp Rude ficht great boat/motor sold 11-21
    pulled by a 2500HD Denali will all the BANKS upgrades
    MAGA 45-47
    ASE/GM Master tech before tools

  7. Member
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    Jan 2024
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    Scottsboro AL
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    276
    #7
    Quote Originally Posted by mactlman View Post
    same with lifepo4 batteries ok after they bought a company!
    yep for sure !
    2022 Caymas CX 19 / Mercury 225 Pro XS

  8. Member
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    San Angelo, Texas
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    #8
    Quote Originally Posted by mactlman View Post
    same with lifepo4 batteries ok after they bought a company!
    Funny how they were so adamantly against it before then