Michael Schumacher has been forced to change an engine in part ferme due to an problem. The engine was the 5th unit Schumacher has used this season and has been replaced with one he has already used.
The rules changed in the last couple of years so that engines can be changed without penalty as long as a driver does not exceed his allocation of 8 engines for the season.
However it does mean that the engine which was taken out cannot be raced again, which is a setback for the Mercedes team, with 20 races to cover with 8 engines.
Most drivers were on either their fourth or fifth engines, with only Charles Pic in Marussia, using a sixth engine at this race.
Drivers on Engine #4
Alonso, Massa, Di Resta, Kobayashi, Perez, Ricciardo, Vergne, Senna, De la Rosa, Karthikeyan
Drivers on Engine #5
Vettel, Webber, Button, Hamilton, Schumacher* Rosberg, Raikkonen, Grosjean, Maldonado, Kovalainen, Petrov, Glock
Drivers on Engine #6