But it goes deeper than that...again, not sure if this info is current:
From O'Reilly Lube Tech FAQ:
Question: Who makes O'Reilly's brand of oil?
Answer: O'Reilly's brand of oil is manufactured and packaged by Omni Specialty Packaging. Omni is an independent lubricant manufacturer in Shreveport, LA. While Omni is not affiliated with any "major" manufacturer, we do buy our base oils from companies like Exxon/Mobil and Shell. Lubrizol Corporation manufactures Omni's additives. Lubrizol is the largest lubricant additive manufacturer in the world."
Bud_One, you beat me to it!!!!