Mercedes has suffered a “setback” with the development of its Formula 1 engine ahead of the 2019 season, according to team boss Toto Wolff. The German manufacturer has dominated the current era of power unit regulations since their introduction in 2014, with Mercedes taking a clean sweep of five constructors’ and drivers’ world championship titles since. Ferrari made significant gains ahead of the 2018 season to close the gap but Mercedes was still able to come out on top as Lewis Hamilton claimed 11 victories on his way to clinching a fifth drivers’ crown. 5774263478001 CrashTV:  But Wolff revealed the reigning world champions had already encountered some problems with its...
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