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The Opti's don't use oil the same way a normal 2 cycle motor does. It "atomizes" the oil into very fine droplets, more efficently useing the oil. The DFI oil is a synthetic product, specifically designed to be used in the Opti. USE THE MERC DFI OPTI OIL ONLY IN YOUR 2001 AND NEWER OPTIMAX MOTORS! Unfortunately, it's not cheap. About $25.00 a gallon.

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