octane?

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Mark Northcutt

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HAD A 1987 MERC 175 CARB THAT SAID IN OWNERS MANUAL TO USE SUPER PREMIUM FUEL 91 OCTANE.
NOW IVE GOT A 1999 MERC XR6 150 WITH NO OWNERS MANUAL. WHAT OCTANE DOES MERC RECOMEND FOR THIS MOTOR? OR DOES IT MATTER ? THANKS MARK
 

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