IndyCar's two main championship contenders Will Power and Scott Dixon are among the six drivers who will have to overcome 10-place grid penalties at this weekend's Milwaukee round.
Power (Penske) and Dixon (Ganassi) will both be required to make unauthorized engine changes for the Milwaukee race after suffering engine failures during testing at Iowa yesterday. Last weekend's Texas race winner Justin Wilson (Dale Coyne Racing) and A.J. Foyt's Mike Conway also encountered engine problems at Iowa this week and will take the same penalty.
The other two affected drivers, Rahal Letterman Lanigan's Takuma Sato and Sarah Fisher Hartman's Josef Newgarden, changed their engines after Texas.