The iridium tipped OEM engine spark plugs in the Hyundai Theta II 2.4 liter inline four cylinder motor of a second generation (2010, 2011, 2012, 2013, 2014 & 2015) Kia Sorento should last up to 100,000 miles, but they should be checked before that time to verify that the engine is running properly. To view my DIY instructions for the procedure (including the replacement part numbers) click on the text link or thumbnail image below.
2010-2015 Kia Sorento Theta II 2.4L Engine Spark Plugs Replacement Guide