Good to see confirmed that I was on target using the "PGI" acronym in reference to filters made by them, like topic MicroGard and CQ Premium. That, as distinct from "Premium Guard" labeled brand/line of filters.Just some info I found digging around the 'net. Shows the big connection between Premium Guard Inc (PGI) and the in-house MicroGard branded products at O'Reilly Auto Parts.......
As for filter numbering system, agree that format used, eg. Fram, Purolator, Wix, not necessarily an indication of filter manufacturer. Excellent example, back when I first joined the forum, AAP had a filter called the "Total Grip" (I used many) indisputably made by Purolator that used the "Fram" numbering system. So,14610 was labeled a 7317. And in my observation store brands often just carry over the original numbering system format when they change manufactures.
As for topic filter, I was surprised to see 'what looks to be' a silicone adbv on the base MicroGard. Nice addition, especially so if carried across all applications.
Thanks for c&p.