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sorry gius the site address above had a typo, the correct one is: https://www.amsoil.com/lit/databulletins/g2175_rev2_06.pdf

Just to bring this valuable thread up to date: The original Amsoil filter used for this test in 2004 was most likely the Wix regular paper filter they resell. They now have new patented nanotechnology paper filter, which offers much better flow and filtering performance then any filter listed...