BTW, I looked in the service manual and owner’s manual maintenance table. Ignition coil change intervals are not mentioned.
On the subject of XWEK... This is largely anecdotal and very little science behind the claim I am about to make... but I am not on year 4 of my battery. Anyone who has lived in AZ for any substantial length of time knows that battaries are good for two years due to the sharp changes in temperature and our blistering hot summers. My wife and I bought our 2016 Hyundais only a few months apart and we had to replace her battery last fall. I believe the XWEK is the reason for the improved battary life.... sorry for the thread jack but I wanted to throw that out there. I will be getting the new XWEK model even though I have the old.