You purchased your A4 because its a reputation for performance and German engineering struck a chord inside you; so why would you settle for second rate when it comes to the highest quality auto parts? Audi automobile drivers have become used to a certain level of sporty handling when driving their A4 around town. Anyone who drives a Audi knows that when it comes to maintaining their vehicle only the highest quality replacement parts will do. When your Audi A4 was born, it was destined for a person with discerning taste who prioritizes European styling in their automobile.
Reducing harmful hydrocarbons and noxious gases that come from your car or truck depends on your use of properly functioning exhaust and emissions parts. No engine is 100% efficient, and each one (even the one on your Audi A4) uses a PCV valve to control its positive crankcase ventilation. Usually located on your valve cover or cylinder head, your Audi A4 PCV valve captures and re-routes exhaust blow-by from the combustion process and sends it back through the intake. This is much better than simply venting it into the atmosphere, which is what all engines did before they were equipped with a positive crankcase ventilation valve.
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