Vettel set to start US GP at the back as Aston Martin plans F1 power unit change

Drivers are permitted to use three internal combustion engines per season on their cars, but a number of them have already triggered grid penalties by exceeding the allocation in the 22-race season.
Valtteri Bottas took grid drops for Mercedes in both Italy and Russia, while team-mate Lewis Hamilton dropped 10 places on the grid in Turkey after his own change as Mercedes manages an engines …Keep reading