Jimmie Johnson scored his second NASCAR Sprint Cup victory in as many weeks at Dover, holding off Brad Keselowski in a late-race restart.
Hendrick Chevrolet star Johnson dominated the second half of the race, having wrested the lead from Matt Kenseth's Joe Gibbs-run Toyota on lap 180.
Clint Bowyer attempted a bold two-tyre strategy at the final round of pitstops to briefly grab the lead, but Johnson dispatched him within seconds of the restart and was never again headed.
A final yellow flag, due to Casey Mears' tyre falling to pieces inside the last 10 laps, meant a four-lap shoot-out to the finish, but Johnson kept his cool once more.
Poleman Keselowski finished second in his Penske Ford, having closed the gap to Johnson in the penultimate stint, but he was unable to do anything about the six-time champion in the final reckoning.
Kenseth finished third, escaping a hairy moment when Bowyer got into the back of him at the final restart.
Denny Hamlin was fifth, despite an early pitlane speeding penalty.
The race was red flagged twice, once to clean debris from a crash involving Roush Fenway duo Greg Biffle and Ricky Stenhouse Jr, which was started by AJ Allmendinger, and a second time when the track came apart at Turn 2.
Ryan Newman tore up part of the concrete race surface into the path of Jamie McMurray, whose car hit the wall after he'd slammed into the debris.
The track required repairing, which meant a lengthy delay, but no further issues were encountered after the restart.
Results - 400 laps: Pos Driver Team/Car Time/Gap 1. Jimmie Johnson Hendrick Chevrolet 3h23m52.000s 2. Brad Keselowski Penske Ford +0.885s 3. Matt Kenseth Joe Gibbs Toyota +2.008s 4. Clint Bowyer Waltrip Toyota +2.326s 5. Denny Hamlin Joe Gibbs Toyota +2.745s 6. Martin Truex Jr Furniture Row Ford +3.445s 7. Tony Stewart Stewart-Haas Chevrolet +3.738s 8. Joey Logano Penske Ford +4.176s 9. Dale Earnhardt Jr Hendrick Chevrolet +4.284s 10. Paul Menard Childress Chevrolet +4.644s 11. Kyle Larson Ganassi Chevrolet +4.987s 12. Aric Almirola Petty Ford +5.114s 13. Jamie McMurray Ganassi Chevrolet +5.359s 14. Carl Edwards Roush Fenway Ford +6.036s 15. Jeff Gordon Hendrick Chevrolet +6.747s 16. Marcos Ambrose Petty Ford +6.839s 17. Kevin Harvick Stewart-Haas Chevrolet -1 lap 18. Kurt Busch Stewart-Haas Chevrolet -1 lap 19. Kasey Kahne Hendrick Chevrolet -1 lap 20. Austin Dillon Childress Chevrolet -2 laps 21. AJ Allmendinger JTG Daugherty Chevrolet -3 laps 22. Brett Moffitt Robinson Toyota -4 laps 23. Danica Patrick Stewart-Haas Chevrolet -4 laps 24. Reed Sorenson Baldwin Chevrolet -4 laps 25. Casey Mears Germain Chevrolet -5 laps 26. Justin Allgaier Hscott Chevrolet -5 laps 27. Cole Whitt BK Toyota -6 laps 28. Josh Wise Parsons Chevrolet -10 laps 29. David Gilliland Front Row Ford -12 laps 30. Blane Koch FAS Lane Ford -12 laps 31. Ryan Newman Childress Chevrolet -13 laps 32. Ryan Truex BK Toyota -13 laps 33. Dave Blaney Humphrey Ford -17 laps 34. Landon Cassill Hillman Chevrolet -18 laps 35. Michael Annett Baldwin Chevrolet -22 laps 36. David Ragan Front Row Ford -50 laps 37. David Stremme Circle Sport Chevrolet -103 laps* 38. Greg Biffle Roush Fenway Ford -108 laps * Not running at finish Retirements: JJ Yeley Xxxtreme Chevrolet 232 laps Alex Bowman BK Toyota 208 laps Ricky Stenhouse Jr Roush Fenway Ford 131 laps Kyle Busch Joe Gibbs Toyota 125 laps Brian Vickers Waltrip Toyota 73 laps