What is the capacity of engine oil in 1999 Peugeot 306?

My friend bought a Peugeot 306 which is having the wrong length gauge meaning When he checked the oil it showed less than what was really in it then he has completed, I was responsible for an oil change for him, as he did spill As I'm filling blind I need to know the oil capacity engine and it has no manual car is a 1999 Peugeot 306 LX 1.6 if that helps

You'll need to know which engine, or the registration number; http://www.castrol.com/castrol/iframe.do?categoryId=9024084&contentId=7044829

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