Quote:
Originally Posted by Remonster
Easy way to confirm: run the engine at idle while it's making the sound and take off the oil fill cap. If the noise goes away, you should replace the valve cover. The integrated PCV valve diaphgram tears and causes crankcase pressure to be too high. Opening the oil fill cap lets the pressure escape and the noise stops. We just fixed this on an M4 yesterday by replacing the valve cover.
The excess crankcase pressure causes air to whistle as it blows past the rear main seal or elsewhere. IMO, if you have the noise it's best to fix it soon before you cause the oil seals to fail and then you have to deal with anther expensive repair like dropping the transmission to replace the rear main seal.
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How long take to damage the rear main seal.?