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The 1989 Mercury 125 hp outboard motor typically requires a fuel mixture of 50:1 for optimal performance. This means mixing 2.5 ounces of two-stroke outboard oil with one gallon of gasoline. Always use high-quality marine-grade oil and fresh fuel to ensure the longevity and efficiency of the engine. It's advisable to consult the owner's manual for specific recommendations and any updates.

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4d ago

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