@RushRuin and Helmsman unfortunately I don't have anything to help you guys. The engine was dismantled to some extent by the dealer and BMW's regional M technician I believe and they found nothing. A few thousand miles later (maybe 8-9k on the ODO) the ticking miraculously disappeared. Totally bizarre. I had the car up to about 50k miles or so before trading it and there were zero engine or other problems.
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-Matthew
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