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What causes a noisy engine in a BMW 3 Series?

I have noticed a loud rattling noise coming from my car's engine. It seems to be worse when I accelerate. Any idea why this could be happening? Should I be concerned?

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The most common cause of a noisy engine in a BMW 3 Series is a failing or loose serpentine belt. It's important to get this checked out as soon as possible, as a worn belt could eventually break and cause even more damage to the engine.

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