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|Funny coincidence. Just this weekend I had a noise suddenly crop up that sounded much like this. It was a fairly high-pitched swirling noise, like a bearing going bad, but was intermittent and independent of engine speed or load. I tracked it down to the oil pump/filter area. Since the oil pressure is pretty constant, my guess was a tear in the oil filter flapping around. It was not near due for a change, but oil and filter changes being about the cheapest thing I can do to this car, I changed them. So far, the noise seems to be gone. Worth a try.