Apparently, nobody has an opinion on air filters... I was just at our local Kia Dealership on Friday for routine maintenance. They recommended changing my air filters, both cabin, and engine, for $111.90. I declined. I ordered the applicable filters from Autozone for $37.98 (free shipping to my residence in a day) and changed the filters in a matter of minutes. It IS so easy to do. That's a savings of $73.92! That's why, until lately, I've always avoided going to dealerships for service.