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What happens is the oil 'burns' on a hot spot, and little tiny flakes come off over time, and get stuck in the valve lifters, making this noise.
It sounds like a single lifter to me.
On my old V8 a 50/50 mix of Redline 5W30 and M1 0W40 was able to clean most of it out over the course of about 15000 miles...
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