This place is great for being laughed off the forum. Just think what they will say when I tell them that nearly all of the motor oil suppliers buy their base oils off the open market. With nearly all of the major brands, they buy from the different suppliers. That goes for Shell, Sopus, Chevron, Mobil, and many others. When I see someone say pennzoil uses base oils from this or that place, I just laugh. They all also formulate with whatever thay have on hand, mixing Grp I, II, II+, and III together in some cases. but mainly II and III, from whoever there supplier might be that time. The various company refineries sell their base oils to the various blending facilities, and they usually buy from whatever company is closest. ie... It would make no sense for a Chevron blending facility on the east coast, to buy from the Chevron facility in California, so they buy from the Mobil facility in New York.