That tractor is a rebadged Kioti, as are most of the filters and parts. In fact, here, Bobcat maintenace kits are cheaper than Kioti's and have Daedong labels under the Bobcat ones. That said, here are the oils recommended by Kioti. The Mobil 424 is the one most people go for and easiest to find.
Daedong : utf55
Shell : Donax-TD
Exxonmobil : Mobilfluid 424 , Exxon Hydraul 560
BP : Tractran UTH 5