The PCV (positive crankcase ventilation) valve in a 4th generation 2016, 2017, 2018, 2019 and 2020 Kia Optima with the Theta II 2.4L GDI I4 engine should be checked every 30,000 miles and possibly changed every 60,000 miles depending on your driving conditions. Check out my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.
2016-2020 Kia Optima PCV Valve Replacement Guide
