I believe this is the standard PAO that both Mobil and Amsoil have been using for the past several years to get their high VI's and low pour points.
Mobil makes much more basestock than they can use themselves - I think they have about a 35% market share in the sale of PAO's to other companies ....
I thought the supersyn PAO was actually an Exxon developed basestock. Now it's just the very high molecular weight, Spectrasyn PAO ....
TS