My '11 te250 (also an Xlite motor) doesn't have that hose at all. Oil changes are easy. Hopefully that line can be dealt with, but I have no idea what it's for or what should be done with it.
Air filter changes are a pain. I'm just resigned to pulling the battery. If you run an extra short length of battery cable you can pull the battery without disconnecting it. I haven't bothered with that yet.
On that note, check the routing of the battery cable to the starter relay. They put it under a tab on the subframe to hold the cable, but the tab cuts through the insulation of the cable which is no good. The '12 may be different.