DPi saw the return of competitors taking part in IMSA's Endurance Cup championship. The Ally Cadillac Racing entry returned in line with its Endurance Cup schedule, while all six full-season DPi teams added a third driver. Scott Dixon returned to Cadillac Racing's #01 entry, while Ryan Hunter-Reay guested in the team's #02 after last appearing at Sebring. Loïc Duval continued in his endurance role for JDC-Miller MotorSports, as did Mike Conway and Hélio Castroneves for Whelen Engineering Racing and Meyer Shank Racing respectively. Toyota factory driver Brendon Hartley joined Wayne Taylor Racing, replacing Will Stevens.
