Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 19Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 19

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MAINTENANCE
IMPORTANT: Inspect oil for signs of contaminationOil contaminated with water will have milky color to it; oil contaminated with fuel will smell strongly of fuelIf contaminated 011 is