Sergio Marchionne still talking GM

• Fiat Chrysler Automobiles (NYSE:FCAU) Sergio Marchionne is still talking about a merger with GM even with the Ferrari IPO in the spotlight this week.
• Marchionne said S&P Ratings doesn't know what it's talking about after the rating firm dismissed the possibility of the two automaker groups combining.
• Sergio's constant drumbeat on automobile industry consolidation has taken on new significance after the Volkswagen scandal exploded last month.