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Why is my BMW Z4's engine making a whining noise?

I've noticed a high-pitched whining noise coming from my BMW Z4's engine. It only happens when I accelerate. What could be causing this and what should I do about it?

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It could be a sign of a worn-out belt or a loose pulley in your engine. It's best to have a professional mechanic take a look at it and replace any necessary parts.

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