Weird engine noise on my Mercedes C200 W202

Description

My '97 Mercedes Benz has started making this weird noise. I don't know what it is, but it comes from the engine. The noise appeares when the engine goes at about 2000 RPM, and fades away at about 3000 RPM. It comes back at about 5000 RPM, but not as loud as 2-3K RPM. I would appreciate it if anyone could help me find out what this noise is! :S

Keywords

Weird, engine, noise, Mercedes, Benz, C180, C200, C220, W202

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