As promised (again) I just cut open the Wix/Napa Gold oil filter, and here is what I found:As promised, I cut the Fram filter open today.
Cardboard ends? Yes. But, solidly glued, no gaps anywhere, no degradation.
36 pleats in filter.
Rubber anti-drainback valve.(I know...filter wa just used for priming and running engine to dial it in again). Flat steel end spring that keeps the filter tight in the can.
Outer can: .0110 thickness.
Overall, nothing leaping out as horrible.
Will do a similar autopsy on my Wix/Napa filter when the time comes.
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As promised (again) I just cut open the Wix/Napa Gold oil filter, and here is what I found:
Real coil spring on top of filter media. Fram had a weaker, flat spring. Probably means the Fram would bypass at a lower oil pressure.
Wix/Napa had .130 can metal thickness vs. Fram .110.
Wix/Napa had 58 pleats in the filter media vs 36 for the Fram.
Wix/Napa filter has solid steel end caps that are superbly bonded to the filter media. So much so that I could not pull them apart by hand, unlike the Fram.
My opinion? Fram is a good filter that is made as cheaply as possible to get the job done.
Wix/Napa is better made with better materials and more filtering media.