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Motor oil is not the correct use for hydraulics that I remember. No anti foam or other special additives there. Internal engine properties are totally different than hydraulics using pressure for fluid. Most hydraulics use thinner viscosity than most motor oil typically around 10-20w.
When I made a living as a heavy equipment mechanic for a large construction company back in the late 70's to early 80's all the Cat equipment, from the little D3/931 up to the d9's, 631/637 pans and everything in the middle used 10 weight motor oil for the hydraulics. Not sure what they use now but at one time it was very popular for this use.