I haven't seen anything but a bunch of guys saying there filter minder does not suck down anymore, which means it flows more. Now if it flows better and filters better is not seen. Yes, amsoil says it does but they are a company selling a product, I don't think any company would discredit a product they sell.
We need conclusive UOA to make an educated decision, not a bunch of guys making a guess.
I would say this about any company not just amsoil but since amsoil is the company in question then that's who it's aimed at in this post.
Do I beleave amsoil puts out quality products, YES.