Perhaps this is some of the detail you seek???
I received this from a Brad Penn rep.
Thank you for your inquiry on our Penn-Grade™ 1 Racing Oils. To give you a little bit of history, Kendall lubricants were refined at our Bradford refinery from 1881 to 1997. In 1997, the Kendall name was sold to Sunoco. Since then, the Kendall name has been sold to 76 and I believe now, Phillips/Conoco owns the rights to the name. At the same time, American Refining Group, Inc. (ARG), a privately held energy company headquartered in Philadelphia, Pennsylvania, purchased the old Kendall refinery in Bradford, Pennsylvania from Witco Corporation.