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Drive it a bit and change the oil. If it's normal looking and only like that under the cap, it's fine / normal / from cold and short drives. If more oil is milky walk away.
Does cost an oil change though. If you're very serious about the car it could be worth it.
Both my N55's can sometimes look like that and I'm certain that neither has a head gasket issue. But it doesn't mean that particular car doesn't.
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