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I own an 01 1500 with the 3.9 and I was looking at my intake(stock) and I see a black rubber line leading from the air box to the crankcase breather. Is it necessary to keep this hooked up or can I unhook it. The reason for the question is I have had several people same that it will blow oil but I say BS due to it going back to the air cleaner
 

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the PCV valve is the one that has issues on the 5.9 engines but I have not heard anything about the 3.9s. The PCV valve runs from one valve cover to the intake manafold. Fumes are sucked from the valve cover to the intake man. and the PCV valve is supposed to keep oil out. I would leave both hoses where they are.
 
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