Is everyone who rides behind an indmar powered boat using the suggested octane 89n petrol or is it ok to run octane 87......My uncles have boats aswell, one has a mb with a merc power plant and the other rides behind a calabria with a merc i think.....they are running octane 87 fuel. but they have more money than they know what to do with so repairs arent an issue.....you would think running octane 89 wouldn't be an issue either. I cant see it being a problem if that is what you run from new.
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