Junior's Auto Fit cap

General Motors has officially agreed to sell its Opel and Vauxhall brands to the PSA Group as the Detroit automaker attempts to stanch more than a decade of staggering losses in Europe.

Last week was a difficult one for Tesla. After the carmaker waged a public war of words with federal safety regulators, CEO Elon Musk picked a Twitter fight with a magazine and may have improperly revealed financial information.