I had to replace the motor. The original Briggs was blown and Harbor Freight has a nice little replacement that bolts right on - all the holes line up - for $99 if you have the coupon. So I am running whatever oil was recommended with the motor. For the hydraulics, I used some NAPA hydraulic fluid. Not that I'm particularly well versed with things like this but I didn't understand why they used 30W motor oil and I decided that hydraulic fluid was better formulated for this kind of use. I drained all the old stuff out (and it was very ugly - a combination of 30W, hydraulic fluid that someone had added, and water from sitting in a backyard for a few years) and changed the filter which I also got at NAPA. It leaks a little from both the valve and the ram (and I changed the O-rich on the ram) but not so much as to pose a problem. I figured that the ram leak provides a little lubrication for the brass shoes on the beam as the ram extends and retracts.
