1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 315Get this manual
Routine Inspections f111 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 when trim and tilt cylinders are fully extended Add OMC Power TrimTilt and Power Steering Fluid or GM Dexron I as needed to bring level up to the bottom of fill plug thread Loosely install fill plugCycle unit in ten second spurts (adding fluid as needed)A minimum of five complete cycles is required to purge air from the system
2Look for indications of internal fluid leakageCorrect the cause if leaks are noted