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Both of my engine crane's hydraulic cylinders have a small rubber plug that looks like a button about 1/2 way up the cylinder..you pry it out and add the oil there...it was missing on one of them,someone put black electrical tape over the hole!..I tapped it to 1/8 " pipe and put a pipe plug in it...I used an nearly empty 90W gear oil bottle and the pointy spout to fill mine up--figured a little 90W wont hurt it,and it does seem to pump up faster and leak less with it in there...