They have been, at least the Bosch Premium US made. WS Workshop likely too, when US made. The coo for both is now Mexico. Afaik, Purolator US never had an oil filter manufacturing facility there. Otoh, Wix to the best of my knowledge did. So, it's possible M&H (which owns both brands) now make Bosch. At least that's my best guess. So afaik now, Bosch oil filters no longer made by Purolator US.