K&N 33-2466 Air Filter 2011 2012 2013 2014 2015 2016 Chevy GMC Duramax Diesel 2500 3500 KN 6.6L V8. CLEAN ONCE EVERY 5 YEARS: Engine air filter only needs cleaning every 75,000 miles under normal highway driving conditions (5 years based on the average miles driven per year of 15,000 miles).
