Volkswagen used devices to cheat air pollution tests in diesel luxury vehicles in model years 2014 through 2016, US and California environmental regulators said on Monday, widening their investigation into the carmaker's emissions scandal. The US Environmental Protection Agency (EPA) said it is now looking at 3.0-liter V6 diesel engines used mostly in larger, more expensive models like the Porsche Cayenne sport utility vehicle in addition to the smaller diesel engines whose test-deceiving software were initially targeted by the agency. The move pulls luxury brands Porsche and ...