Employees clean a Fiat 500 Abarth during the media day at the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. Flush with cash and confidence after years of rising sales, German carmakers are used to reaping industry-leading returns. But with Chinese demand abruptly slowing, the profit engine has begun to sputter, overshadowing the glitz of the world's biggest auto show which opens in Frankfurt. REUTERS/Kai Pfaffenbach