German Economy Minister Karl-Theodor zu Guttenberg says US car giant General Motors appears willing to help save its Opel subsidiary.Guttenberg spoke to reporters after talks with General Motors Chief Executive Rick Waggoner in Washington. The German delegation is due to meet US Treasury Secretary Timothy Geithner later today. Opel and its counterpart Vauxhall say they need 3.3 billion euros in state aid in order to survive. Guttenberg said it is essential for GM to find a private investor or take a minority stake in the company. Berlin is open to the possibility of helping Opel, but has said it needs to be sure no state support would find its way across the Atlantic to GM, which is seeking more bailout help from the US government.