I try to buy as much American stuff as I can too, I don't know how anyone runs their boat, I only know mine and I don't run it hard, the Mercruiser filters are three times more expensive as Frams,
I've been using them in my boats for thirty years and have never had a failure due to the oil or filter, but I change my oil more frequently than most, I appreciate your passion, but like everything else in this world "to each his own"