Well neither the ester or PAO suspend the add pack or keep seals from leaking. The "base" is at least 10% Grp I and maybe a smidge Grp II.
I would suspect that some of the premium PAO-based oils have some ester and that the predominately ester oils have some PAO. Either may contain some amount Grp II.
The fact that Amsoil did not test the Redline may be that it was too close in performance to their oil.
Wonder what sort of market share Redline has? Maybe they didn't test it because of low overall market share? Really, who is their competition?
Just a thought.
I would suspect that some of the premium PAO-based oils have some ester and that the predominately ester oils have some PAO. Either may contain some amount Grp II.
The fact that Amsoil did not test the Redline may be that it was too close in performance to their oil.
Wonder what sort of market share Redline has? Maybe they didn't test it because of low overall market share? Really, who is their competition?
Just a thought.