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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As a deployed service member, there are not many avenues of contacting companies back home conveniently. Between the time difference and use of wifi or morale phones, it can be challenging. Luckily the team at LateModel Restoration emailed me back quickly and gave me everything that I needed for a smoothe purchase, and a few more that followed. They were quick in reply and quick to help me out and I have my parts on the way to my home now because of it. I will be shopping here primarily and I recommend it highly to fellow Mustang folks.