VW CEO Martin Winterkorn and Fiat CEO Sergio Marchionne

VW CEO Martin Winterkorn and Fiat CEO Sergio Marchionne

Jason Alden/Bloomberg

Volkswagen AG CEO Martin Winterkorn, left, and Fiat SpA Chief Executive Officer Sergio Marchionne, shake hands following a meeting at the Fiat SpA stand, on at the Paris Motor Show in Paris.