I know there is only a finite number of refineries in the world. For the record, I am a Royal Purple guy, and have been running it in my Mustang GT and motorcycle (Honda CBR 954rr) for many years, but I digress. However, I recently purchased a 2016 Subaru Forester XT for my wife and I get 2 years of free maintenance. After a little research, I discovered that Subaru has their own line of motor oil, just like Ford has a Motorcraft line of oil. However, no amount of online research states who actually refines (manufactures) Subaru motor oil, specifically their synthetic oil. I have hear that is is manufactured by Pennzoil. Does anyone know with any certainty?