N80, I have the turf tires for the front but it gets better traction in the snow with the Ags on the front. Also a bit easier to steer with no power steering.
Kubota In Canada, looks like a nice rig but needs a fat bucket on the front

If I remember correctly the hydraulic fill plug is near the shifter. Just a little dip stick deal. Here is a quick picture of the breakdown. It is 011 in the picture. The right side is the rear end of the tractor.
As for quarks, run the glow plugs for close to a full minute to start it in freezing temps.