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Did you consider that the variance could be due to different types of oil? Just a thought, what about sending them a clean sample (fresh from bottle) of both oils just to get an accurate baseline...there could be trace elements in the fresh oil.
I can understand your concern over the Copper, but look at the drop in Molybedenum from 18 to 1 and the drop in Boron from 31 to 3...given these wild differences, the increase in Copper from 11 to 17 could also be due to the same factor (my money is still on different oil).
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