Talks aimed at saving General Motors Europes Opel unit broke down amid acrimony between Germany and the US on Thursday as fears mounted for tens of thousands of jobs across Europe. The marathon negotiations were aimed at finding a suitable buyer for GMs struggling European operations,with the German government willing to offer billions of euros (dollars) in loan guarantees to any potential investor. But at the last minute,GM and the US said they needed an extra 300 million euros in temporary loans from Germany to keep Opel afloat.