When i was a teenager my buds dad had an evinrude outboard on a 16 foot boat.Cant remember the h.p. I know it was a v4.The only oil he ever mixed in his 6 gallon fuel tanks was half a quart (50-1)of chevron 30 weight auto oil. in the cardboard cans. This boat lasted 35 seasons.I would not recomend this type of mix in todays high tech efi lol.