The basic engine, the in-line six-cylinder OM 457 hLA, which has been tried and tested again and again, has a displacement of twelve litres. This turbodiesel engine meets the highest performance requirements.

It is horizontally mounted in the Citaro LE and provides the two output levels of 220 kW (299 hp) and 260 kW (354 hp). The maximum torque is 1250 Nm and 1600 Nm respectively.