The recent history of the results of car company mergers is mixed. Renault and Nissan virtually merged in 1999 and share Carlos Ghosn as their CEO. There is no compelling evidence that the marriage has hurt — or helped — either company. Chrysler and Daimler merged in 1998, but the deal was a failure. The Germany company sold most of the American one in 2007. Chrysler promptly went into Chapter 11.