Horner: Mercedes’ struggles with F1 engine reliability “very unusual”

Mercedes revealed on Friday ahead of the United States Grand Prix that Valtteri Bottas would be taking a third grid penalty in four races after having a new engine fitted to his car, as the team manages an ongoing issue. 
Mercedes customer teams Aston Martin and Williams have also been forced into engine penalties for this weekend, leaving Sebastian Vettel and George Russell at the back of …Keep reading