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      02-15-2018, 06:51 PM   #22
Pladi
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Drives: 2011 335i xdrive
Join Date: Nov 2017
Location: Waterloo, ON Canada

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Man i can tell you with 100 % certainty that both noises you are hearing are normal And my car has those both. The second one that comes from the alternator always comes ON then OFF later i think its part of the alternator charging circuit. I did not hear any screeching sounds like how you described. The first sound is you vanos. If you open the oil fill cap it sounds so much worse. Apparently completely normal.. Even on new N55.. i dont hear anything that sounds like an issue.. only saw the vid to 1:03