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  1. #1

    Synthetic oil??? which brand can be use in s/c engine?

    last week i tried "CASTROL R4 JASO MA Certified"
    topspeed & acceleration still same as the oem mineral oil

    is it work? have anyone tried this R4 ?


  2. #2

    Join Date
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    just be sure they specify " no friction modifiers added"......as the 0W40 Amsoil states....then you should be OK.............mp

  3. #3
    Tube Master's Avatar
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    Apr 2005
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    AMSOIL, 0-40 4-stroke

  4. #4
    The only two I know of are Amsoil and Royal Purple.

    As stated be certain it doesn't contain friction modifiers and it should also say 'wet clutch compatible'. If not, you will have problems.

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