The PCV (positive crankcase ventilation) valve is part of the positive crankcase ventilation system, which reroutes crankcase blow-by to the intake manifold and back to the engine, where it's re-burned in the cylinders as part of the fuel/air mixture. This cuts emission pollution and increases fuel economy because unburned fuel in the blow-by is consumed the second time around. It also keeps the blow-by and water vapor from fouling the oil in the crankcase, thus reducing the formation of engine sludge.
Shipping speed was amazing. Got it in 2 days and the PCV valve does what it should. My old one was bad and I was consuming too much oil between changes and performance was down some. Now my cars not drinking oil like it was and I'm very happy with my purchase!!
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