(First off, apologies in advance to the
mods, if this is veering too off-topic, please feel free to split this into a separate thread)
This is exactly what I wanted to know as well so I started looking into the K900. In the warranty manual, it states:
Note the language in the warranty manual for other 2017 Kia models omits the "K900" part from the above, so the K900 is something unique. You can look up the Authorized K900 Kia Dealers on their dealer locator, there's a filter to show only those. In my area, there are 3 Kia dealers within a reasonable < 1 hr drive, but none of them are K900 authorized.
Of course any maintenance, i.e. oil changes, etc, can be done by anyone (even yourself) and your warranty is good as long as you keep documentation proving that the services were performed, however, for mechanical failures eligible for warranty repair, if the Stinger is like the K900, it sounds like you are required to take it to one of these "authorized" dealerships. Yikes. For a Korean car with as much tech as the Stinger, that worries me a great deal as my nearest dealer is 70 miles away.