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The Evinrude HPF - Pro gear oil is the absolute best for your outboard, but the Merc or Quicksilver Hi-Performance gear oil is OK also. Stay away from the Merc Premium gear oil as that is only a basic hypoid lube and only recommended for midrange and smaller motors.
"Hypoid" oil refers to the stuff that they used in car rear ends back yon. Hypoid gears are where the pinion gear runs below the centerline of the ring gear. High tech at one time, nothing unusual nowadays. Plain 80-90wt outboard gear oil will work fine in your 18. The Quicksilver even better.
