Mercedes-Benz, like many carmakers, is embracing the turbocharger en masse in reaction to calls for greater fuel efficiency. Smaller, forced-induction mills are spreading throughout the three-pointed star’s lineup; the only naturally aspirated holdouts are the company’s gasoline V-6s and the mighty 6.2-liter V-8 found in select AMG models. While such high-tech downsizing rarely comes without [.]