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  1. #1
    Member
    Join Date
    Sep 2016
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    Bolingbrook IL
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    839

    Merc Newbie....250 ProXS 4 Stoke Fuel question....

    What octane fuel are you guys running? (new to this motor coming out of a G2)
    Thanks in advance.

  2. Member
    Join Date
    Aug 2015
    Location
    Alabama
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    207
    #2
    minimum octane is 87

  3. Member
    Join Date
    Mar 2018
    Location
    Godley,TX
    Posts
    175
    #3
    87
    2019 Phoenix 919 Pro XP - Mercury 225 Pro XS V8

  4. mikesxpress
    Guest
    #4
    Just what the manual and engine decals say. 87

  5. Member
    Join Date
    Sep 2020
    Location
    Ooltewah Tn
    Posts
    18
    #5
    I run 87, and USUALLY non-ethanol... even though it isn't required

  6. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
    Location
    Greenville, SC (US)
    Posts
    95,253
    #6
    Welcome to the Merc Family!

    If you would, please take a moment to review the Announcements at the top of the Forum, and be sure to provide the Required Info (serial number) when posting. Thanks!

    As suggested above, 87 octane.

    From the FAQ Section:

    Fuel and Fuel Additives for 4-stroke Models


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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