Karl Thomas Neumann, Chief Executive of Adam Opel AG and President of General Motors Europe (R) and Dan Akerson General Motors Chairman and Chief Executive Officer arrive at the Adam Opel AG headquarters in Ruesselsheim April 10, 2013. General Motors pledged to invest 4 billion euros ($5.2 billion) in Opel by the end of 2016 to support new model launches, renewing its commitment to its loss-making European brand. REUTERS/Lisi Niesner (GERMANY - Tags: BUSINESS)