I am a technician at a Toyota dealer. While we do sell quarts of "Toyota Genuine" oil, our bulk oil gets delivered by a tanker. Up until Toyota started offering pre-paid maintenance with a new car purchase, we used Pennzoil, Rice oil, Kendall, etc. Toyota had a bit of a fit and said "Look, we're paying your dealership for these oil changes, you are GOING to use our oil. And that was that. I highly suspect it's like that for every Toyota dealership, not just ours. By the way, I just pulled a quart of Toyota oil off of the shelf, and NOWHERE on it does it say Mobil. It says "Made in the US with domestic and foreign components." The oil comes out looking VERY clean at regular intervals, unless the car was previously neglected, and the engine had a lot of deposits that needed broken up by the detergents. I use it in every car I own. Good stuff. I'll ask an instructor or my FTS, or my DPS next time I see them or next time I call Torrence, CA for tech support to see if they'll tell me exactly who makes it.