Re: 135 hp evinrude flushing the hydrilic oil
mantis...procedure for filling is, tilt engine all the way up or as far as it will go. Add fluid to reservoir even with the fill plug hole. This is the round canister you described with a big screw in it. Cycle up and down and leave engine in the up position. Check reservoir level and repeat process. Cycling the tilt up and down bleeds the air from the system. If the reservoir was fairly empty, this may take a couple fillings to get the reservoir full. Remember, to get a true reservoir level, the engine must be tilted all the way up. Good luck.
