Guy in that thread said that was the view from inside the center tube using a borescope. So in that case those louvers are basically stamped out in the opposite direction of most louvers. They are sticking out towards the media, not towards the center of the center tube. Strange louvers... These... plus the out of place pinched adbv.. This guy knew to check but what about the untold number of customers who just grab these and screw them on ?? .. I wonder what happens ?
https://www.mustang7g.com/forums/threads/purolator-boss-oil-filter-quality-control-problem.164928/
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