The engine air filter element in a 3rd generation (2011-2014) Kia Optima equipped with the Hyundai Theta II 2.4L I4 GDI motor should be checked or cleaned at every oil change and replaced when dirty. Check out my quick DIY tutorial for the procedure, including replacement part numbers, by clicking on the text link or thumbnail picture below.
Kia Optima 2.4L I4 Engine Air Filter Replacement Guide
