1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, Service Repair Manual P/N 507875, Page 408Get this manual
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Routine Inspections f1l 1 Check reservoir fluid level at least once per season or every 50 operating hoursSystem capacity is approximately 25 floz(740 ml) Unit must be in vertical position Check fluid