I see the MicroGard Select filter is the same as the Premium Guard Extended Life and STP Extended Life. Aside from the colors/stickers and boxes the only difference is that the STP is made in China. Also, the STP says 20 microns vs 25, but that’s probably just a typo. Can we buy these somewhere cheaper in bulk? Oreilly’s is $10.99 and Autozone is $9.99.