PCV Valve

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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 rocker arm cover.