The iridium tipped OEM spark plugs in a first generation (2010, 2011, 2012 & 2013) Kia Forte with the Hyundai Theta II 2.0 liter inline four cylinder engine can last up to 100,000 miles, but they should be checked before that mileage. Take a look at my DIY tutorial for the procedure (including the replacement part numbers) by clicking on the text link or thumbnail image below.
2010-2013 Kia Forte Engine Spark Plugs Replacement Guide
