Re: Opel
GM's Opel/Vauxhall Insignia is a world car, sold in US and China as Buick Regal. The old Saturn brand was basically the same thing, with the Astra and Vectra. The crucial difference in the lineup is that in Europe most Insignias are sold with diesel engines, whereas in US they're all petrol/gasoline. They used to be very different in the engine bay, but many are now are based on the same turbo-4cyl units.
IIRC GM looked at shifting the European operation out of the company during the last financial restructuring. If things get sticky for GM's light duty diesels then a divorce may again be on the cards. However, if the action stems from purely US-derived test data, this push would only come about if the Eurozone pursued all manufacturers and Opel were found guilty of VeeDubbing the emissions as well.
Biting the hand that feeds IT
