Automakers

RUSSELSHEIM, Germany -- General Motor's Corp.'s efforts to globalize its automotive operations and switch to brand-specific management were conceived at its world headquarters in Detroit. But live tests for both efforts are being born at Adam Opel AG, part of GM of Europe's massive complex here not far from Frankfurt.The Opel Omega MV6 is being Americanized to be sold in the U.S. next fall as the

byFrank Washington