Green was ordered to drop to the end of the longest line for his team leaving equipment outside his pit box. Biffle led at the lap 147 restart. Vickers had an understeer that caused him to spin into the turn four wall with his car's right-hand side on the 160th lap, causing the ninth caution to be displayed. Most drivers (including Biffle) made pit stops for fuel and tires during the caution. Hamlin became the leader for the lap 166 restart. On lap 181, Kahne got ahead of Hamlin and became the new leader. Green flag pit stops began on the 202nd lap. On the next lap, Bowyer exited his pit box without a catch can, and it fell off, causing the tenth caution. Most drivers chose to have four tires installed on their cars under caution. Kahne continued to lead at the restart on lap 210. Debris from Kvapil's shredded right-rear tire was located in the second turn 26 laps later, triggering the eleventh caution. The leaders (including Kahne) again elected to have four tires fitted to their cars during the caution. Hamlin got back to the first position, holding it at the lap 240 restart. On the following lap, Kahne passed Hamlin to regain the lead. Riggs and Mears then got past Hamlin to move into second and third three laps later. Four laps later, the twelfth caution was necessitated: Sauter's right-rear tire disintegrated exiting turn one, and he spun on the apron. Under caution, most of the leaders again took on fuel on pit road. Kahne continued to lead at the lap 254 restart. The second round of green flag pit stops commenced on the 287th lap, with Kahne maintaining the lead after all were completed nine laps later. A thirteenth caution was called for debris in turn two on lap 306. The leaders (including Kahne) again made pit stops for fuel and tires. Burton took the first position for the lap 310 restart. Four laps later, Mears lost control of his car in turn four, and bent his vehicle's rear bodywork and spoiler in a collision with a barrier. He turned down into Kyle Busch on the frontstretch, who was turned into the right-hand wall with his left-hand quarter, and slid into the infield grass, triggering the fourteenth caution. Several cars swerved to avoid the accident. Kyle Busch put his window net down, and vacated his vehicle to venture towards the track while NASCAR officials restrained him.