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octane for 77 merc 1500

T

tastethefreshness

New member
i have seen a few things online about people saying to use 89 or 93 octane on old inlines, cause they are prone to detonation. does anyone have a recomendation?
 
That's exactly what I've always heard. Also read up on timing. I think there was a bulletin from Mercury about backing the max timing down from the original spec due to changes in octane over the years.
 
I always use 89. One other thing you may want to pay attention to is ethanol. I always use BP gas, which at 99% of stations does not have ethanol. Ethanol, even at 10%, may cause problems.
 
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