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Best Octane for 98 250 OX66

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  • Best Octane for 98 250 OX66

    I am aware the manual states an 86 octane mimimum. I have been using 93. (new boat for me) Am I wasting my money on premium?

  • #2
    From what I have read yes you are wasting the money, the motors are designed to run on 87 and the higher rated fuel burns slower and does not let the motor develop all the HP because it does not burn all the fuel in the cylinders. My even cause some problems by burning the rest in the exhaust

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