After just four years, Mercedes gives its S class a facelift. But the new developments have less to do with design -- where there are only a few subtle changes -- than with technology. Underneath its elegant metal hull, the S class has implemented savings measures in its engines.<br /><br />For more Mercedes go to http://www.dw.com/en/daimler-ceo-diesel-is-worth-fighting-for/a-39836524
