I read a couple of threads that the AC Delco filters at the dealers are different then the ones you get at the part store. I never believed it and always thought it was just the dealer trying to upsell filters. Fast forward to today. I was at the Chevy dealer getting my silverado serviced. I have a Chevy impala that takes the same filter PF63E and it will be coming up for service soon I do that car myself since it is out of warranty. Anyway I went ahead and bought the filter from the dealer. It’s different then the ones I used from advance. Thicker gasket, holes are a little smaller, and it is heavier weight wise. Still an ecore but seems to be a heavier built ecore. Me thinks I will get them at the dealer from now on. Same price so why not