A general view:- whilst I really feel for the original Poster & I have been in the
engine blown situation.. The "G" it is not really a "tinkering with car""
By all means change oils & filters as and when you like.. BUT - surely with the "G" being a higher end vehicle I feel (and do) have my new vehicles checked and oil/filters replaced once a year at a Hyundai dealership.. The cost is negligible as against the heartache and worry now being experienced on the posters 2009 Genesis......
We are on our 7th "H" and have had minimal warranty claims (Azera Battery/Elantra Radio) - I still feel the yearly dealership receipt (oil/filter)
is the most cost effective way to ensure your "H" Warranty..