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I’ve had many OMC & Mercury outboards & a dual deluxe 17 footer 2 stroke OMC 2 V-4 88hp motors. I ran 24 to one on the OMC boat per manual & all others on l5-1. I always used either OMC or Mercury brand oil except my 1954 15hp Evinrude super fastwin. Inside the shroud it stated to run one quart of oil per 20 quarts of fuel. I used a G.I. can 5 gallons – one quart to 19 quarts mix. The manual said 1 quart to 16 quarts also. Never had any issues with that motor, ran very well. I never opened it up because it was on a plowing hull not a plaining hull, about 3/4 throttle max. Also I always mixed the oil with 2 gallons of fuel per quart, then added the rest of fuel to get a great mix, every little bit helped the motor plus I never had an open quart of oil on board to get contaminated with dirt or water.