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Hi I have a 2011 335, not sure about the build date. I removed the oil cap to see if the chirping noise would go away indicating a problem with the PCV valve. The noise did not subside (thank god) but there was a noticeable suction on the oil cap as I was removing it. Also there was a fairly loud rattling/clinking noise coming out of the oil cap opening. Is this bad? I removed the cap before the engine had warmed up on a ~35 degree day, not sure if that would make a difference.
Thanks!
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