The iridium tipped OEM spark plugs in a 5th generation (2010, 2011, 2012, 2013, 2014, 2015 & 2016) Toyota 4Runner SUV can last up to 100,000 miles but they should be checked well before that mileage to see how the 1GR-FE 4.0 liter V6 engine is running. Take a look at my DIY tutorial for the procedure (with the replacement part numbers) by clicking on the text link or thumbnail image below.
2010-2016 Toyota 4Runner Engine Spark Plugs Replacement Guide
