Hybrid technology is implemented in the S 400 Hybrid drive system. An electric motor supports the combustion engine according to driving situation, and helps to reduce fuel consumption. The electric motor generates parts of its energy through regenerative braking and stores this in a lithium-ion battery. This intelligent combination of petrol and electric drive helps to reduce fuel consumption in city traffic by up to 25%. The S 400 Hybrid complies with the EU5 emissions standard.