Simplicity ZTR Hydraulic oil

[Catenary Kid]

Just purchased a brand new (old stock) Simplicity Courrier ZTR (2691661) and am in the process of adding it to my small engine specs spreadsheet. I've culled through all the books the dealer gave me with it but have no idea what type of oil to use in the drive units. I'm assuming it's a hydraulic oil but what brand, kind, weight?

 

[StarTech]

SAE20W50 motor oil per IPL. Preferably Synthetic

 

[Catenary Kid]

Grazzi!