Please see
@MolaKule's
post #48 above.
AMSOIL is a blender. They don't need to do anything else besides buying the materials and blending them. They can choose to slightly tweak the recipes to enhance certain aspects of their blends. Before David Granquist retired from Red Line Oil, I spoke to him on several occasions, and he told me that's how Red Line does it. Red Line Oil never submits any of their motor oils for approvals. They use additive packages that are designed to blend lubricants that then become candidates for approvals. The way he worded it in one of our email exchanges:
A few of the HP Motor Oils are being reformulated specifically to address LSPI concerns, products recommended in late model direct injection, forced induction engines. These HP oils are not submitted and approved, they use packages that are.
AMSOIL is going a similar route now. They no longer wish to be bound by strict OEM requirements, especially when those requirements stand in the way of blending a higher quality motor oil.