The MAN D26 engines have been proven to comply with the strict emission limits in accordance with Euro 6, not only on the test bench but also during mobile emission measurements (PEMS) under real driving conditions. The emission behaviour is checked on different route profiles, with different weight utilisations, and throughout the complete warm-up phase. Additional technical developments such as optimised thermal management, the two-stage fuel filtration system or the demand-based actuation of the three-phase alternators by means of the LIN (Local Interconnect Network) interface provide the best in motor performance.