Ferrari chairman Sergio Marchionne says doubters are wrong to call his bluff, insisting anyone who doesn't take his quits threats seriously is "playing with fire". After reviewing last month the broad lines of Formula 1's proposed 2021 regulation platform, Marchionne issued a quit threat, saying he would not hesitate to pull Ferrari out of Grand Prix racing if its interests were no longer in line with those of the sport. Ferrari has occasionally threatened to wreak havoc on the sport in the past, but without ever following through. Pundits believe Marchionne's warning is just more of the same, but the Fiat Chrysler boss says he is dead serious. "Some people say that our...
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