Volkswagen said Tuesday that 1.8 million commercial vehicles are among those affected by the emissions-rigging scandal, while Spanish unit SEAT said 700,000 of its cars were fitted with the diesel engine in question. Volkswagen AG has admitted using a piece of engine software to cheat on diesel car emissions tests in the U.S. It said last week the engines concerned are in some 11 million vehicles worldwide, far more than the 482,000 originally identified by U.S. authorities.