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Does the F25 N55 have a PCV valve that needs to be replaced periodically like in the old days when the cheap PCV check valves would eventually get clogged and stop working.
Also the setup in the photo above will not impact the function of the system at all. It just adds an inline catch can to trap some of the oil vapour.
Most of the intake valve fouling is caused by oil leakage past the valve seals although the PCV system does add to it.
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