I always used Duplex Outboard Special. We used a lot and they made dad a distributer. That meant most of his Evinrude dealers carried it and we also then got it at half price. . . 😎

The first round can with a cone top and a spin-off cap I remember was Phillips 66 and it was somewhere around 1960. The rectangular cans were common to most brands for a few years before that. I remember in 1957 or 58 buying one brand of outboard oil in round glass jars with a spin-off cap.
Dave

here are some quick shots of my display of grease and oil cans with a few other odds and ends. Enjoy

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Thanks, The rectangle duplex is a special one, it came from Riggs Smith who got me into collecting the old outboards. The glass Penzoil are also special, my Dad had three of them and he would buy 2 cycle oil from the local small engine repair shop. He had two 5 gallon cans that he would take there and they would be picked up at the shop and taken somewhere and get filled and then brough to the shop and Dad would go pick it up. He would fill the bottles from the can so he could measure it for the mix