You've chosen a GMC auto for its great performance. And when the time comes that such performance is reduced just because of a faulty PCV valve, never delay the replacement. Dated back in 1963, vehicles had no PCV valves and used road draft tubs that allow the hydrocarbon emissions from the crankcase out into the open air instead. Good thing, the automotive technology today is already advanced that the contemporary GMC autos are already equipped with PCV valves. The purpose of a GMC PCV valve is to regulate the flow of crankcase fumes into the intake manifold where they can be burned. Moreover, it also prevents flow back of the emissions into the crankcase. Through such way, engine backfire is prevented. The GMC PCV system is also crucial to proper engine sealing as it alleviates crankcase pressure which can push out seals and gaskets and cause oil leaks. But despite the importance of the PCV system, it can never be denied that more often than not, it gets completely overlooked during routine maintenance. It shouldn't be that way since a PCV valve that comes to its failure often leads to other problems in other areas. You can check your owner's manual for PCV maintenance and replacement intervals recommended. You can tell right away that you're having a faulty KYWORD when there's presence of oil leaks, and if the PCV system isn't operating correctly that the crankcase pressure is already building to force oil gaskets and seals to get blown. You have nothing to worry though, if only you know where you can turn to when such time comes. And to make everything on your PCV system work fine, our online store offers you the finest line of aftermarket GMC PCV valves. You can have a look at our wide selection of replacement auto parts and accessories by looking at our comprehensive online catalog.