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hum or whine

  1. Horrgakx

    Mechanical hum/whine when engine turns off

    Car is C250 AMG Line Premium Plus Diesel. When I turn the engine off I notice a faint mechanical hum. Does anyone know what this is? I suspect that it could be an electric pump which circulates engine oil in order that the turbo oil doesn't cook. But does anyone know for sure? Link to...
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