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I'd note, based on my experience with the VW system, that the alert doesn't have to be particularly loud...it just has to be different from any other sound the car makes. VW's system just silently flashes the oil light when the pressure is low at idle, and other conditions (e.g., key in, door open) make a beeping sound, but the high-RPM oil pressure alert is a raspy sounding buzzer. It's instantly attention-grabbing because it's a "new" sound in the in-car environment.
For the Mercedes, given the headlight warning buzzer sound as a "normal" part of the environment, I'd suggest a piezo buzzer...the high-pitched, pure-tone "EEEEE" will stand out from the car's normal noises.
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