No, Microgard Select/Premium Guard EX are made in Vietnam.I don't have an O'Reilly's by me, but I do have an AutoZone and they have an STP extended life and that's made in China is that the same filter?
Don't premium Guard, Ecogard and microguard aren't they all the same filter? The premium line?
Looks like the STP uses multiple different designs, some from CHAMP, WIX, etc while Microgard Select uses the same design throughout their whole line.