opel-rtr26yw0_comp WASHINGTON, Aug 24 (Reuters) – The Obama administration will not use the U.S. majority-ownership stake in General Motors Corp. to influence the automaker’s choice of a buyer for its Opel operations in Europe, an administration official said on Monday. The official, asked whether the U.S. Treasury’s autos task force would weigh in on the issue or leave it up to GM’s management and board, said the administration was available to consult with the German government on the Opel issue, but would not get involved in GM’s decision.