The engineers of Daimler Buses employed all available means to achieve maximum efficiency of the Citaro. A multitude of measures counteract the inevitable added weight of the additional or larger components that the move from Euro V to Euro VI entails.
The centrepiece of the drive system is the new BlueEfficiency Power engine. The in-line six-cylinder Mercedes-Benz OM 936 h engine in the Citaro single bus is characterised by robustness, longevity and maximum cost-efficiency with regard to fuel, motor oil and AdBlue consumption as well as by long maintenance intervals. A distinctive trait of this engine is high torque at very low engine speeds and an excellent throttle response. Both qualities are part of the prerequisites for successfully taking the place of the predecessor engines that to some extent had significantly more displacement – the keyword in this context is downsizing.
In addition to the drive system the development engineers carefully examined the ancillary components with an eye on fuel economy and longevity. Alternators, battery management, radiator fan and air compressor – these and other components play a major role in fuel consumption and in both model series were optimised down to the last detail.