I have changed from the purolater classics to the Napa Gold (Same As Wix) and noticed the threads on the napa gold filters did not look good and upon further investigation the inner middle tube was not centered perfectly. I am thinking of buying the Asian filters that i tried when purolater started having quality issues this year. This was one filter i looked at so it might not be an issue it could be just this filter but i will be watching. The cheap Asian filters were made really nicely just dont like the big black letters that say made in China it makes us look bad.