I was told by my salesman (ok, I know don't trust them) that the engine in my Scion was a Corolla engine and it had the 10k oil change interval. I had a maint required led come on at 5K miles and when I took it in, the service writer told me that I was due an oil change. When I told him about the 10K interval he just shut me down and told me that it was a 5K engine and the engine was a Camery engine. I could have sworn that the owners manual also said that I had a 10K engine. What gives?? I am about to contact Toyota about it though. It is much more expensive to do oil changes at 5K vesus 10K miles plus the type of oil that is required to be used.