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This valve ventilates your engine and causes the soot from the oil to be burned with the gasoline mixture. If you don't replace it when it needs to be replaced you will collect soot and gunk in your engine, gas mileage will suffer and oil consumption will increase. It will also eventually lead to a premature engine rebuild. But why wouldn't you replace it. It is absolutly the cheapest part on your car.

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Q: What can happen if the PVC valve is not replaced?
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