Both Ricky Taylor, starting driver for the No. 7 Penske Acura ARX-05 prototype, and co-driver Helio Castroneves led during the early hours. Along with third driver Graham Rahal, the Acura remained in the top three until the car suddenly lost oil pressure just as the race reached its six-hour midpoint.
Less than one hour later, the sister No. 6 car of Juan Pablo Montoya also ground to a halt on track with no drive, following contact with another prototype. The resulting driveline damage ended the race for Montoya and co-drivers Dane Cameron and Simon Pagenaud after completing 203 laps.