from the Mercury website:
2001 models and newer Mercury MerCruiser engines beginning with serial number 0M300000 will operate satisfactorily when using a major brand of unleaded fuel meeting the following specifications:
USA and Canada - Have a posted pump Octane Rating of 87 (R+M)/2 minimum. Premium gasoline [92 (R+M)/2 Octane] is also acceptable. Do not use leaded gasoline.
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