I have a Cincinatti Toolmaster 1B that came with manuals, but all of the specifically spec'd brand/type oils seem like they are long-unavailable. I did find some old data on the oils' viscosities and characteristics, and came to the conclusion that modern good-quality hydraulic oil is darn close if not quite spot-on- I can't remember if I concluded that ISO46 hyd. oil or ISO68 hyd. oil came closest, but I think that I may have gone with the lighter weight since I have an unheated shop and temperatures drop pretty low here. Then again, my Cincinatti seems to weep oil from multiple locations like it wants to be the Exxon Valdez when it grows up- so maybe the thicker viscosity hyd. oil would have been better (or maybe I just need to attend to root causes of the leaks...)