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  1. #1

    Default what oil auto vs mercury 10/40 25/40 ect

    I have A 1987 Mercruiser Thunderbolt 5.0 305ci . I'm getting ready to change the oil and have called 5 different marine machanics and have got 5 different answers. Everything from 10w40 to straight 30 to only merc 25/40. what is your thoughts on this.

    Thanks Carvguy

  2. #2
    Supreme Mariner bruceb58's Avatar
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    Default Re: what oil auto vs mercury 10/40 25/40 ect

    Yes!

    I agree!
    1998 Wellcraft Eclipse 24 Cuddy
    Volvo Penta Duo-Prop 7.4L "LK"

    2006 Sun Tracker Party Barge 21
    Mercury 90 4-Stroke FI
    "Common sense is not very common"
    "Failing to prepare is preparing to fail." -- John Wooden

  3. #3
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: what oil auto vs mercury 10/40 25/40 ect

    NOT another oil thread ................
    Read this last one that kind of stopped a couple days ago. It should answer your question.
    http://forums.iboats.com/mercruiser-i-o-inboard-engines-outdrives/merc-oil-vs-mobil-1-a-392463.html
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  4. #4
    Commander 45Auto's Avatar
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    Default Re: what oil auto vs mercury 10/40 25/40 ect

    Mercruiser factory recommendation below. If you don't believe that thay know what they're talking about, then use whatever you want. Someone will post that whatever you use is the greatest oil ever made for boats!

    Any opinions expressed above are worth exactly what you paid for them!

  5. #5
    Supreme Mariner bruceb58's Avatar
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    Default Re: what oil auto vs mercury 10/40 25/40 ect

    45Auto always believes adding confusion to an oil thread is a good thing!

    EDIT...hey where did the carb picture go?
    1998 Wellcraft Eclipse 24 Cuddy
    Volvo Penta Duo-Prop 7.4L "LK"

    2006 Sun Tracker Party Barge 21
    Mercury 90 4-Stroke FI
    "Common sense is not very common"
    "Failing to prepare is preparing to fail." -- John Wooden

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