C 3500 Truck 2WD V8-454 7.4L (1990)
Crankcase Filter: Service and Repair
The PCV system should be checked every 15,000 miles and also during regular engine tune-ups. If the PCV system includes a breather filter, located in
the air cleaner housing, this filter should be replaced whenever the PCV valve or air cleaner is replaced. When a periodic inspection indicates the PCV is
not functioning properly, it should be serviced by replacement only.
