Reply To: is 100 octane good or bad?

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June 7, 2022 at 11:43 am #261111
Don
Participant

    US Member

    High octane fuel is not needed, or recommended for most of the older lower compression OMC outboards.  Believe it or not, the high octane fuel can actually rob power from these engines.  I know it seems counter intuitive, but it is true.   Regular unleaded is just fine/mixed with the proper amount of oil.  True today’s fuel degrade sooner and damage some fuel system components.  So, be sure to drain the carburetor and tank completely if the engine is not going to be used for a few weeks.