| Burnett wins 2 GM ad accounts Chicago Tribune, United States - GM is consolidating its Buick, GMC and Pontiac brands into one dealership channel, and the automaker said it made sense to similarly bring the advertising ... GM Reveals Buick-Pontiac-GMC Ad Agency Consolidation To Align ... General Motors gives Buick, Pontiac and GMC ad business to one agency Ad agency gains Buick, GMC after Cadillac loss |