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7 Factors to find an Optimal 2-Stroke Fuel/Oil Ratio

Updated: Nov 24, 2023


What's your optimal 2-stroke fuel/oil pre-mix ratio? There are 7 factors for you to consider when determining your optimal 2-stroke fuel/oil ratio​ for your outboard.


Less Oil Needed

  • Running more consistently at lower RPMs

  • A water-cooled outboard with a good impeller, water pressure, and flow

  • Running two-stroke oils with a higher viscosity

  • You don't often run your boat at wide-open throttle

  • You burn gas without ethanol, most pump gas in the USA is at 15%

  • The air temperature is at a lower overall ambient level

  • Your motor has advanced plating, like Nikasil, on the sleeves


More Oil Needed


  • Running more consistently at or above the manufacturer RPM rating

  • Your cowl does not provide any extra air cooling to your powerhead

  • Running two-stroke oils with a lower viscosity

  • You often run your boat at wide-open throttle and for longer runs

  • You burn pump gas with 15% ethanol vs. recreational or race fuel

  • The air temperature is at a higher overall ambient level

  • Your motor has standard steel/iron bore sleeves

Use the chart above and score whether you are right or left of the dividing line.




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