new tractor - what transmission/hydraulic oil ?

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I got a new to me Bolens/Iseki diesel tractor. It calls for SAE 80W oil for the shared transmission/hydraulics. The transmission is manual not hydrostatic.

What's the right fluid to replace this ? I'm thinking it would resemble Hy-gard more than anything, but that's only a SWAG.
 
On a viscosity comparison chart, that's about the same as straight 30W engine oil.... which is what I ran in the trans of my Iseki.
 
Thanks, I'm going to hunt up the Schaeffer's when it's due. It has the right viscosity and meets gl-4 and j20c specs.
 
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