We are a lot or anal retentive freaks. Valvo isnt a syn in the real sense, IMO. Nor is any other US made OTC oil beyond M1 0w40, TTD 5w40, and GC. Of course this is based on my education here. As stated already, does it really matter? PP we know isnt a true syn and most love it. Those of us that arent its faithful sill appreciate it. Want a true syn, pay for it.