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It depends on the engine and the oil you use - some synthetics easily go 15,000 km or more, while mineral oils prefer changing sooner, maybe every 8-10,000 km. Check your car's manual, it'll tell you the right interval for your specific model, because they vary quite a bit.
Your car's owner's manual is the only reliable source, because manufacturers know exactly what your specific engine needs. In my case I've always followed it and with a car that's now old I've never had any problems, whereas a friend of mine who did his own thing ended up with oil that degraded before it should have.
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