The engine is the heart of the car's appeal: a naturally aspirated 6.2L V8 making roughly 500-503 hp, praised for a howling exhaust note precisely because there are no turbos or supercharger. Owners describe it as so powerful that they feather the throttle in normal driving, and it is thirsty at a real-world 10-17 MPG. …
The M156 6.2L V8: naturally aspirated character, sound, and thirst
Mercedes-Benz R63 AMG (W251) · driving