 Brad Keselowski's engine expired with 40 laps to go, causing Jamie McMurray and Ryan Newman to collide, and this brought out the fourth caution of the race.Keselowski told reporters that the blown engine was caused by "something in the oil pan, broke something important", while stating that he was "starting to get position," ahead of the final 100 miles of the race.Roughly half of the field pitted for fuel under the caution, with the other half staying out for track position, but without assurance that they had enough fuel to make it to the end of the race.