I think most of the new hydro gears use a variation of engine oil in them. Even my newer skid loader uses 10W30 instead of hydro oil! One pail services the whole dang machine. I think I remember reading in the manual for my ma's mower that it took 20W50 oil in the hydro too. 50 hrs first change then 200 hours after? I think she has a 2138. It's close to that number anyway.
My Gravely zero turn has dual hydro gear in it and I run 20W50 API SJ synthetic in those. I change the oil and filters every other year regardless of hours.
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