100 PAO can happen if all the PAO used in the formula model is 100%. Long time ago people got on that same kick at Sherwin Williams and 100% acrylic paint. The acrylic used is 100% pure but is only part of the formula along with fillers,binders,cobalt,soap,etc. I wouldnt want a 100% PAO OR ester for that matter. I will say that the ones using majority of the two are producing a better product but they need a market and price is part of that. Sometimes the lower grade product fits the job better.Why worry about D1G2 spec in a 15 yr old car? I do wish Amsoil had stayed to their SS line just like Redline did an OE. These are overkill oils that shouldnt dumb down product.