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Does anyone know the proper gas to oil mix ratio for a 1979 15hp Johnson outboard?

joecercone, I'm assuming your engine is a 2 stroke, it should be the usual 50:1 mix. I had a 1978 Evinrude 115hp, used the same mixture. Most stores carry the oil in containers that are ready to add to 5 gal gas containers.

Good fishin'........

Thanks Chet. I thought that was correct but couldn't verify it.