General Motors, the world's largest car-maker, is in talks with BMW about using the German manufacturer's high-performance diesel engines in its Cadillac luxury cars in Europe after doubling forecast sales in the region.

GM is also considering using engines from its joint venture with Fiat, an Italian manufacturer, which are already used in its Saab cars. It is also possible that an Isuzu V6 diesel used in the Opel/Vauxhall Vectra could be improved for Cadillac.