I remember when the Mobil 1 filters were all made by Champion, here in the US and were generally excellent, then Mann-Hummel took over and (apparently) they were made by Purolator still made here but quality was "questionable " Apparently Mobil 1 got some consumer feedback and suddenly Highline Warren was supplying a higher quality product made in Vietnam and South Korea. The current filter seems to be excellent but would still prefer a US made product.