PCV VALVE
Check PCV valve every 15,000 miles and replace it every 30,000 miles on Light Duty Emission models (up to 8500 lbs. GVW). Check PCV valve every 12,000 miles and replace it every 24,000 miles on Heavy Duty Emission models (over 8500 lbs. GVW). Valve is located on valve cover.
FILTER ELEMENT
Replace filter element every 30,000 miles on Light Duty Emission models and every 24,000 miles on Heavy Duty Emission models. Filter is located in air cleaner housing.