Do you know any of the cars history? We're they using convential oil or semi synthetic or full synthetic? Once you start using synthetic you should never go back, if you don't know use the semi synthetic. Now for your question, I know there is a lot of stuff about Toyota and the 10,000 mile oil change, but I would just stick with the factory recommended of 5000, and of course if you do a lot of around town driving more frequently. I hope I answered you question.
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