Reply To: is 100 octane good or bad?

[frankr]

Back in “The Day” people would seek out unleaded (marine white) gas because the lead caused excessive carbon deposits in the cylinders and spark plugs.  Amoco 100 octane was an unleaded gas, so that was also desirable.   Otherwise, high octane is not needed in our old low compression outboards.  Leaded gas did provide lubrication for valve seats in 4-stroke engines, but no valves in 2-strokes, so not needed there.