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Keep in mind that just because you passed the break-in period in your owner's manual, does not mean that the engine is fully broken in. You can get a used oil analysis done (search Blackstone labs), but metals always look high during the first 7,500-10k miles or so. Also, uoa's generally do not pick up wear metals much larger than around 5 microns.
I've never heard of the a powdery substance being found.
-Dennis
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