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Champion labs is also iso9000 certified factories and a quality product. All they make is private labels. I think they still make STP which is the autozone main product they push now. Years ago when I first started at Auto Shack (zone) they were heavy into purolator.

For 20 years in another lifetime I sold parts. Napa had a display made by wix which is napa of a napa filter,Fram, And ac delco . Fram looked like it was hot glued together with something just better than toilet paper with end caps and valve that screamed junk. Just Google it to see Fram...

Wix was already a world wide company with iso certified factories. This allows them to now offer propriety filters only Mann makes in addition to a very large coverage wix has. Might see some consolidation on the less known brands to the flagship brands.

Any brand but fram.....