I have a couple Amsoil EAO17 filters, a whole bunch of AC Delco PF63 (non-ecore) filters and a few Fram Ultra XG 10575 filters. These filters all cross reference to each other. As you can see from the picture below, can anyone tell me why the Fram Ultra filter is this much smaller than the equivalent filters from AC Delco and Amsoil?
Which one would you run?


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