Yep, just drain it and put it back. I think it needs to be sealed to hold the crankcase pressure. The later models after 2009 apparently have a modified oil breather box (has a dimple in it) so less oil to be drained. You don't lose much anyway, but for me (2008 model) it seems to fill fairly quickly on long motorway runs, otherwise hardly at all. Some people on here have had it replaced/upgraded under warranty. My dealer wouldn't, but I don't lose any sleep over it.
Paul