The only time Wix filters can be bought here for $3 is when the Napa store has a sale and you buy a case of them. I cut open an ordinary Fram, a Wix, and a Motorcraft (made by Purolator). Fram is poorly made. Glued cardboard ends, large pleats in the filtering media, and a stamped piece of steel for a bypass spring, no anti drainback valve. Wix uses an actual spring for the bypass. The ends of the filter are crimped metal, the pleats in the media are much closer due to there being more filtering material, a metal core so the media can't collapse, and a silicon anti drainback valve. The difference between Wix and Purolator is a stamped bypass spring VS an actual coil spring. There may be a difference in the HP series, I haven't seen the inside of one of those. If there is, and it's $8 vs about $6 for a Wix around here, Fram is charging more for the HP for what you get everyday in a Wix.
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Good wrote: