"The M156 is the first V8 automobile engine designed autonomously by Mercedes-Benz subsidiary Mercedes-AMG, as previous AMG engines have always been based on original Mercedes engines. The engine was designed to be a naturally aspirated racing unit, and will also be used in a number of high-performance \"AMG\"-badged Mercedes-Benz models.The M156 displaces 6,208 cc (6.208 L; 378.8 cu in) and shares very little with other Mercedes-Benz engine families like the M155."@en . . .