http://www.ntpog.org/reviews/filters/filters.shtml
http://minimopar.knizefamily.net/oilfilterstudy.html
http://www.mr2.com/TEXT/oil_filter_test.html
try a google search "oil filter study"
http://minimopar.knizefamily.net/oilfilterstudy.html
http://www.mr2.com/TEXT/oil_filter_test.html
try a google search "oil filter study"