These days, as with everything else, you can't trust name brands.

Wix has repackaged Baldwin, Mann-Hummel, and maybe some others and sold them as their own due to production issues. And trusted name brands are beginning to show up with off shore/Chinese/3rd world/south of the Rio Grande made product. Examine the package and the part for these issues.

I believe Wix Racing (R) filters can still be trusted, but I haven't looked at one in awhile. I know some guys who use the race filters with the external filtermag tool. They are expensive, but they work great at pulling ferrous metal out of the oil.

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If the results don't match the theory, change the theory.