On some other car forum, a person claims that Quaker State base oil comes from "superior", as he said, Pennsylvania oil. My thought was that while this was where Quaker State began in early 1900s, it's probably no longer the case, especially after they merged with Pennzoil in 1998 and then were further bought out by Shell last year. This would lead me to believe that the main ingredients of Quaker State oils come from wherever Shell is able to acquire them these days. So, does anyone know for sure when Quaker State stopped using the oil from Pennsylvania? Any links to supporting literature would be helpful. Thanks!