N54 Replacement PCV ValveDescription The N54 PCV Valve is an upgraded replacement PCV valve for your N54 BMW engine and is strongly recommended for your high performance (or higher mileage) N54. The OEM BMW plastic PCV valve does not hold pressure well even when brand new. What the leaky PCV valve means is that when you are in boosted conditions, the "highly" pressurized PCV valve leaks turbocharged pressures into the crankcase. Pending on the condition of your PCV valve it
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