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With all the talk about Catch Cans, we thought it would be a good idea to combine the information into a smaller thread here. To better understand the purpose of a good quality PCV Oil Catch Can and why they are important, we need to first understand the purpose of your Stock PCV System: The PCV (Positive Crankcase Ventilation) system on your engine is designed to regulate and remove fumes from the engine crankcase, and to alleviate crankcase pressure which could cause oil leaks or seal damage. It’s a way for gases to escape in a controlled manner from the crankcase of an internal comb