Positive Crankcase Ventilation: Service and Repair

DIESEL ENGINES
Clean valve cover filter assemblies, ventilation pipes and connecting tube every 15,000 miles. Inspect rubber fittings and replace as necessary, or every 15,000 miles. On 4 cylinder engines, inspect and service PCV valve every 15,000 miles. On V8 engines, replace breather assemblies every 30,000 miles.