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Siren-Type Oscillating Noise (Video Attached)

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317 views 5 replies 3 participants last post by  ishank  
#1 · (Edited)
Hey everyone,

I bought my E39 M5 just a few months ago and have noticed an annoying, intermittent oscillating noise while driving. It almost sounds like a faint but constant police siren. I've attached a link to a video where you can hear it below.

I've read a similar post about this issue and have replaced my power steering reservoir mounts as suggested (the oil filter mounts are new as well), but the noise persists.

I don't have a clue on how to diagnose this. Any help? Thanks!