It’s easily the majority, unfortunately. I’d say 2/3s is a rough ballpark as the floor and that may be conservative.
Amsoil typically has top shelf products; especially their entire lubricants portfolio.
The value with their currently labeled oil filters; made by Champ Labs (since they’ve been owned by First Brands), just isn’t there now with the defects.
And, other labels have jumped ship from poor manufacturing of oil filters, not only limited to Champ Labs.
Wix no longer makes the Napa Gold, for example. That, too, is made by PGI now. Mobil 1 Extended Performance swapped to them as well.
So, I’d be shocked if Amsoil doesn’t address the matter in a similar fashion.
Sorry to somewhat derail your thread, but this topic has been thoroughly covered in the oil filter sub-forum here.
If you do so choose, I know Amsoil will gladly refund your filter costs if you bring up the issue.
I was refunded after I reached out to Amsoil when I had questions over this issue and decided to email them the major thread in the oil filter sub-forums here that detailed and documented the issue as being widespread.
I was told to keep those filters and got my money back, but I chose not run them since I prefer to run extended OCIs.
Folks here just want to make sure you are well informed and getting your value for the investment. Amsoil is typically far and above very good, but like with any brand there can be situations like this; especially if you don’t manufacture the item directly.