Quoting the BMW-web.tv site:
All BMWs have to pass muster on the NÃ¼rburgring. Each new model is given its final touches in the notorious “Green Hell”, the toughest racetrack in the world. A test driver responsible for the ultra-sporty M cars is Mario Metko. He puts the BMW M3 CoupÃ© through its paces around this tortuous circuit. Metko spends an entire day doing what plenty of BMW fans dream of – driving the Nordschleife at the ragged edge.