
Pictured: Opel GTC Concept Car
When it comes to small capacity diesel engines, European manufacturers like BMW and VW are leading the industry. GM diesels, by comparison, lag the competition not only in sales but also in measures such as hp per liter, fuel economy and emissions levels. Powertrain engineers at GM Europe are working to change all that by developing a range of efficient small capacity twin-turbo engines for global markets.
http://www.motorauthority.com/cars/general-motors/gm-working-on-compact-diesels-for-us-and-europe/