Amsoil EAO filters are primarily made by Baldwin but I thought I read somewhere that Champion is also making certain filters. (Not sure though)
Baldwin was the manufacturer of choice back when Amsoil also marketed Hastings.
As you'll note, Amsoil now markets WIX (WINK:WINK) and Donaldson (WINK
I can't find a link that identifies either as having manufacturing in Mexico ..but I believe that Donaldson does.