Currently Fram/Champion and Wix/Purolator/Mann+Hummel seem to be the only two major oil-filter manufacturers in the USA, making aftermarket, OEM, and third-party-branded oil filters.
Are there any other major USA oil-filter manufacturers?
Also, given that there are only two consolidated manufacturers now, quality of the USA oil filters seem to have increased and become similar across different brands. High-grade, synthetic-media USA oil filters like Mobil 1 EP, Fram Ultra, Wix XP, Purolator Boss seem to be of higher quality than Japanese OEM oil filters that are made in Thailand etc., which seem to be more similar to low-grade, non-synthetic-media USA oil filters.
Any thoughts?
Are there any other major USA oil-filter manufacturers?
Also, given that there are only two consolidated manufacturers now, quality of the USA oil filters seem to have increased and become similar across different brands. High-grade, synthetic-media USA oil filters like Mobil 1 EP, Fram Ultra, Wix XP, Purolator Boss seem to be of higher quality than Japanese OEM oil filters that are made in Thailand etc., which seem to be more similar to low-grade, non-synthetic-media USA oil filters.
Any thoughts?