BMW N54 Replacement PCV Valve for 1M, 135i, 335i, 535i, 740i, X6, Z4 440i (F32) Dyno Graph:

Dyno Graph:

or the components on your vehicle are less than healthy (ie

Trusted Tuner: Doc Vu has a documented history of offering hands‑on tuning support across BMW N engines

These will both open and close simultaneously on M vehicles

750i — N63 / N63TU 4

BMW N54 Replacement PCV Valve for 1M, 135i, 335i, 535i, 740i, X6, Z4 440i (F32) Dyno Graph:The RB N54 PCV Valve is an upgraded replacement PCV valve for your N54 Engine and is strongly recommended for your high performance (or higher mileage) N54. The OEM 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 could leak worse