Much as I don't really want to take sides, as I have nothing against Amsoil.....
It's to me, really starting to sound like Amsoil thinks it knows better than those who design and build engines. And have been doing it for far longer than Amsoil has even exsisted.
And that just isn't so. Swill...er synlube acts the same way.
See, this is why I won't use non approved oils. Any oil can claim anything they want. But unless they submit to the auto maker's testing and prove it, that's all it is. A claim.
When it comes to my car, I am the court that you appear before. And the court is not interested in what you think/know/claim, but what you can prove.
And unless you are on the mfg approval list, then you haven't proved anything, and your case is dismissed.