1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 363Get this manual

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Normal Service Every 50 hrsof operation or 60 days (whichever comes first) Severe Service Every 25 hrsof operation or 30 days (whichever comes first) Operation in salt water area is considered "Severe

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