Odd that Pennzoil would back away from the 100% group III formulation. It was their selling point for the "best cleaning" formulation they made, since petroleum base stocks hold contaminants in suspension better.
I will dig deeper on research.
2014 Mustang GT custom ordered to replace the GT500: Sterling Gray, NAV, Recaros, Brembos, Glass Roof, back up camera, 6 speed auto, loaded
2012 Focus Titanium - 18" wheels with handling package
2009 GT500 Shelby (700 rwhp) - sold