Mom buys a very boring, but dependable Camry. Owner's manual calls for 5-30 @ 5K OCI's. I suggest Mobil 1 from the start, but no... Dealership, whom she is conditioned to trust without question, says they urge her to use only "Toyota motor oil, because it meets the warranty requirements, and it engineered for Toyota vehicles." 1st oil change, car comes home with a "Genuine Toyota Oil" sticker, and no next OCI listed. 4,800 miles later mom returns with another change, this time with a Valvoline oil sticker, with a heavily penned next OCI of 3K! I've given up trying to convince her, but I am to the point of thinking Toyota service centers are about like all the others: basically clueless, dishonest, and somewhat confused. I can take a nearby Firestone my Mobil 1 & Wix filter, and for $11, they will change it. With the paperwork from them, showing 5K OCI, with Mobil 1 5-30 oil, will they not be required to honor any warranty needs, concerning that little 4-banger I think so, no matter what goof running the service bay tells dear old mom.