1998 Johnson Evinrude "EC" 25, 35 HP 3-Cylinder Outboards Service Repair Manual P/N 520205, Page 199Get this manual
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37 Fill the gearcase with 9-11 fl oz(264-330 ml) lubricant as follows: Secure the gearcase in an upright position Remove the oil level and oil filldrain plugsReplace the seals if damaged Fill the gear