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Probably not much I can add to this after 66 pages, but fwiw my Mazda 6 V6 has had a similar ticking noise since new and it now has 85k miles and still runs fine and doesn't use any oil. The Mazda folks say it's normal, and I find it only does it on cold days after the engine is warm, which seems to be what some folks have described here.
I'd be inclined not to worry too much about it if it's just a slight ticking that you hear at idle or just above.
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