Hi, I am new to owning a 753c Bobcat skid steer. I do beleive it's a 1997 model year? Anyone have a good way to figure that out? The serial number is - 512734518 and it says C - series on the tag. Anyway the question I have right now is, what's the proper way to check the hyd oil? Off and check it? Running warmed up? Also what is recommended to put init for hyd oil? Thanks Aaron