Biffle was sixth, and Busch, Matt Kenseth, Regan Smith and Martin Truex Jr. rounded out the top 10. Ryan Newman finished 11th to move back ahead of Jeff Gordon into the second wild card slot. Kasey Kahne, who has two wins, holds the other. Gordon was also a victim of the oil, spinning late and dropping from inside the top 10 to 21st after having driven past Newman.
The top 10 drivers in the standings qualify for the 10-race Chase, and two wild cards are awarded to the drivers with the most wins outside the top 10 — provided they finishing 20th or higher in points.
Polesitter Juan Pablo Montoya, who broke the track record in qualifying, finished 33rd after being forced to pit when something broke in the right front of his No. 42 Chevy a third of the way into the 90-lap race. He had tracked Busch for the first 26 laps.
Last year, Ambrose beat Busch and Keselowski on a paint-trading, two-lap dash to the checkered flag. Ambrose passed Keselowski for the lead on the final lap and secured his first Cup victory when a violent crash involving David Reutimann and David Ragan precipitated a caution that prevented Keselowski from making one final challenge.
Busch had the lead in that race, and he learned his lesson well. With all three up front again on a restart Sunday with 16 laps remaining, Busch dived from third to first on the inside of the 90-degree right-hander, outbraking both Ambrose and Keselowski to take the lead for the first time since lap 26.
Busch, who took the lead from Montoya as soon as the green flag flew to start the race, kept Keselowski at bay off his back bumper, with Ambrose seven car lengths back, and pulled out to a 1-second lead as Ambrose challenged Keselowski for second.
Ambrose finally got past him in the inner loop on lap 81, but he was 2.3 seconds behind Busch and seemingly running for second until the dramatic finish.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.