As introduced, it utilized a mechanical fuel injection system designed and built in-house by Daimler-Benz.

The 6.3 L power plant was conservatively rated at 250 PS (184 kW), with 503 N⋅m (371 lb⋅ft) of torque helping to compensate for the 2.82 to 1 final drive ratio necessary for sustained high-speed cruising.

The North American version, introduced in 1977, was significantly less powerful at 186 kW (253 PS; 250 hp) and 488 N⋅m (360 lb⋅ft) of torque due to more stringent emissions control requirements.

Originally developed for racing as a way to prevent engine oil foaming at high crankshaft speeds, which in turn would create a serious drop in oil pressure, it allowed sustained high speeds at full engine power.

The dry sump system also had the benefit of extending the oil change interval to 12,500 mi (20,100 km).