I work for a KIA / Isuzu dealership, and i can tell you that you will need to service your KIA regularly (at an approved KIA servicing center) or you can void your engine warranty.
We had a client in yesterday who had her KIA previously serviced with engine oil, filters etc from an unapproved servicing center who did not use genuine parts. We gladly inspected her vehicle for her, but as she left the service manager exclaimed how she had just lost the warranty on her new vehicle by going elsewhere and using non-genuine parts and lubricants not to KIA specification. She will only find this out if she attempts to claim in the future on her vehicle. It might be prudent to check if your vehicle is still under KIA warranty and then get it serviced regularly to maintain it.
(I can also add that for different models, there are different components changed and checked etc depending on the kilometers your vehicle has done )