I bought a 1984 Ford 4610su last spring and serviced everything except the hydraulic fluid and filter. I have been pricing fluid and there is a broad spectrum in price. I didn't get a service manual with the tractor and haven't been able to find one to even know how much fluid is required. Is one fluid better that the other? I'm thinking of using a Baldwin filter. I would appreciate any advice. The lift works good. The only thing is like many it will leak down after the engine is shut down for a while. No leaks. Also can someone recommend a diesel motor oil. I used Rotella last year but can remember the viscosity.