First Start After VANOS Replace: e36 BMW S50 US

THIS IS LONG AND BORING AND HAS BAD AUDIO! The phone mic pics up disproportionately high frequencies. If you're curious to listen to the sounds of the motor after doing this procedure. It goes through this strange cycling behavior for a couple minutes. It's hard to hear it surging. I'm not sure what is happening. Air trapped in VANOS? Air trapped in coolant? I also had some HVAC elements turned on which I shut off part of the way through.
Eventually, though, that went away and it is purring nicely, so much smoother and quieter than before.

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The extra noise comes in at 0:42 and 1:07