Saab 9-4X to be unveiled at the 2008 Detroit Auto Show

Both Saab and Cadillac will benefit from a new 2.9-litre, twin-turbo, V6 diesel engine under development with VM Motori, which is crucial to the upscale brands’ success. The engine is also destined for Cadillac’s CTS and the next generation Saab 9-5.

Saab’s boss said: "Although they will benefit from shared architecture, the Saab and Cadillac will be two very different vehicles in terms of looks and driving dynamics with no chance of brand confusion."