Intelligent lightweight construction plays a decisive role in bridging the classic conflict of objectives between low weight and high strength in the new CLS. The CLS is thus the first vehicle from Mercedes-Benz to have frameless, all-aluminium doors. Apart from the doors, the bonnet, front wings, boot lid, parcel shelf, various support profiles and substantial parts of the suspension and engines are all made of aluminium.
Aerodynamics plays an important part in the outstanding efficiency of the Mercedes-Benz CLS. Although the new model is wider than its predecessor and thus presents more frontal area to the wind, it was possible to reduce wind resistance by up to ten percent. This is thanks to the Cd value of 0.26, which has been improved by 13 percent.