The positive crankcase ventilation (PCV) system reduces emissions from the engine by capturing “blowby” emissions so they can be recirculated to the cylinders. Blowby emissions are the gases that get past the piston rings during compression and enter the crankcase rather than being burned in ignition. In general, the higher the mileage on the engine, the looser those piston rings are and the more blowby there is.
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