By far the most powerful diesel engine in a Mercedes-Benz car made its arrival in the S-Class in the year 2000. From a displacement of four liters, the light-alloy V8 OM 628 DE 40 LA developed 184 kW (250 hp) at 4000 rpm. It delivered torque of 560 Newton meters at 1800 to 2600 rpm. A top speed of 250 km/h (155 mph) and 7.8 seconds for accelerating to 100 km/h illustrate the role of the S 400 CDI as first among the Mercedes-Benz diesel models.

Wow that's an amazing feat for a 4 cylinder. I wonder what the displacement is?