For the engine, any quality diesel rated oil of the right measures for your climate. I personally use Kubota branded, but only because I can get it at the same time as my hydraulic fluid, and I don't have to think too much. (Last time I bought some, I got the missus to pick up the pack of stuff for my service, and they've given me 4 stroke oil.....and she didn't notice that's clearly wrong. So that has to go back and be replaced with diesel rated, kind of blows up my argument that it's easier to trust your dealer).
For hydraulic fluids, I'd generally use a Kubota fluid. SUDT in cold climates, in mild climates like mine UDT is fine.