Ive been reading that you should use regular 10-30 engine oil in the hydraulic with a hto additive is that correct the previous owner didn't know much about it so I was goin.g to change all fluids in it I figure if he prob. Just used regular tractor hyd fluid if he didn't know. What is the best way to change the hydraulic fluid in it to get as much out of it as I can. And also what motor oil weight do you guys usually use in the engine as well I'm assuming a 15-40
