General Motors gave the world every reason to believe it was done with Europe last year when it sold its Opel, Vauxhall and European GM Financial business to competitor PSA Group for $2.3 billion. So, what's GM up to in Turin, and who is Pierpaolo Antonioli? Antonioli, 54, is CEO of GM Powertrain Europe, directing the Global Propulsion Systems operations in Turin to supply diesel engines around the world. The former Fiat powertrain engineer moved to GM as the U.S. automaker's partnership with Fiat was ending in 2005, when GM decided to go it alone on diesel engines. Although GM got rid of its European auto companies last year, it determined the diesel engine business was strong enough to keep. Antonioli has been running the Turin center since 2009. He spoke with Automotive News Europe Correspondent Nick Gibbs about why GM is keeping this foothold in Europe and why — despite the black eye diesel has gotten in public perception — the technology is still important to the company...