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The correct mixture would be 50:1, roughly one pint of 2 cycle oil to six gallons of fuel. This is provided the engine is not equipped with, and or using the vro injection system. If your oil injection system is operational simply top off your oil reservoir, no additional oil is required.

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16y ago
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Q: What is the proper gas to oil ratio mix for a 1991 Johnson 100 hp outboard?
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