Unless I work next door to the dealer, there is simply no way it makes anything like sense to go through the time and hassle of taking it to them for a top off when I've got oil in the house. And the trunk, for that matter.
To each their own, but I just don't get the rationale behind this at all. Check your tires too, they might be able to top those up as well!
Objects in mirror are slower than they appear.