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  1. 09-08-2019, 08:49 PM #1
    wall
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    87 octane vs 92 or 93 octane

    boat on order not sure how long the wait will be for 300r so might go with 250 pro xs 4stroke no serial at this time...

    every thing I read is saying unleaded 87 octane... I have always ran super unleaded 92/93 octane... will it hurt to run super unleaded in 300r or 250 pro xs 4S?

    thank you
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  2. James 10
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    #2 09-08-2019, 09:06 PM
    Nope read the manual min 87
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  3. TB21
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    #3 09-09-2019, 11:19 AM
    It will promote carbon build up , make less hp and be harder on your wallet running 92/93 octane in a stock compression 300R.
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  4. EuropeanAM
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    Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #4 09-09-2019, 06:44 PM
    +1

    Best to run the fuel the engine was designed and calibrated for.


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