It's interesting. The Proselects I have for my truck (Dodge Dakota with a 3.9 liter V6) do not say made in Mexico or China. On the side of the box it says Gastonia, NC and that is all the indication of country of origin there is. There is nothing about country of origin written on the filter itself. I alwaya took this to mean they are made by Americans at the Wix factory in Gastonia, NC.
Now I bought 4 Carquest Red oil filters for my truck this past Monday. They have a good sale on CQ oil and Red filters for $11.99. On the side of the filter it says in large red letters "Made in U.S.A.". I think these CQ filters are made at the Wix factory in Dillon, SC. Either way, the Proselect and CQ Red are exactly alike in a side-by-side comparison. They even have the same number cast into the base plates, "15515" I think it says. I thought this might be a casting number or stamping ID for the base plate.
Makes me wonder why the Napa filter says nothing at all about origin yet CQ puts it right there on the filter? I wonder if it's a quirk of Napa's marketing. Maybe there is some kind of deal going between Wix, Napa and CQ on who can say what about the origin of the filters.
Maybe Pete C. will let us know.