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An outboard gear oil such as Quicksilver. Normally 80W-90 but for engines over 75 hp Quicksilver recommend their High Performance Gear Lube which is SAE 90
IIRC The high performance oil should not be mixed with the ordinary, " Premium" gear oil
On a big bore high perf engine, why not run the best, Bombardier HPF Pro. No need to go cheap on an expensive gearcase like that. It only takes one quart...