Many cartridge filters are made in China now. Said another way, as opposed to spin on type, less cartridges made in the US as opposed to spin on. Whoever is making them for Amsoil is sourcing this application in China, obviously. Based on anecdotes, Champ Labs has been making the Amsoil spin on filters. I'd try and xref topic cartridge and see if I could come up with a similar Champ cartridge, but can't see application #.
If there is one, be interesting to see what the Royal Purple cartridge for this application looks like, and coo. Champ makes RP spin on filters.
Based on the pic shown, the Amsoil cartridge looks well made imo.