1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Repair Manual, P/N 520210, Page 21Get this manual
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Lubrication Chart Frequency (Days of Operation) Fresh Water Salt Watert As required 30 Days 30 Days
As required 60 Days 60 Days
Some areas may require more frequent lubrication