An ACDelco GM Original Equipment Positive Crankcase Ventilation (PCV) Valve is an emission control component and is a GM-recommended replacement for your vehicle’s original component. The PCV valve controls the volume of crankcase vapors that are drawn into the intake manifold; a restricted PCV valve can cause oil leaks or increase oil consumption. This original equipment PCV valve has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.