Contested over 267 laps on the 1.5 mile (4 km) speedway, it was the 18th race of the 2015 NASCAR Sprint Cup Series season.

He failed to lead a single lap and finished a disappointing 35th after cutting down a tire and crashing out late in the race.

The race had 13 lead changes among eight different drivers, as well as a new track record of eleven caution flag periods for 49 laps.

This was the 31st career victory for Kyle Busch, second at Kentucky Speedway, and third at the track for Joe Gibbs Racing.

The Quaker State 400 was carried by NBC Sports on the cable/satellite NBCSN station for the American television audience.

[12] "We want to see more lead changes on the racetrack," NASCAR Executive Vice-President and Chief Racing Development Officer Steve O'Donnell said in a media teleconference.

This is not a test, this is a race," O'Donnell said of the rules package that was in effect for the 18th round of the 2015 Sprint Cup Series.

"[12] For this weekend's race, teams were given nine sets of Goodyear tires versus the normal allotment of eleven.

[13] "Under all the circumstances we were faced with (at Kentucky) … the desire from the majority of the garage to get some more time on the track prior to the race became our priority at that point.

We didn't know if we'd even get to a point where we could get cars on the track, so we elected to go early and have everybody focus on setting up for the race.

"[15] Along with Travis Kvapil and Michael McDowell, Ryan Blaney and the Wood Brothers Racing team failed to qualify for the second week in a row.

"[16] In his weekly appearance on the Sirius XM NASCAR Radio program The Morning Drive the Monday after the race, NASCAR Executive Vice-President and Chief Racing Officer Steve O'Donnell explained to Mike Bagley and Pete Pistone NASCAR's decision to cancel qualifying despite the final practice session being held at the time qualifying was scheduled to be held.

The first caution of the race flew on lap 19 when J. J. Yeley, running on the outside, got loose and made contact with Josh Wise in turn 3, sending him into the wall.

Kyle Busch exited pit road with the lead after taking both right-side tires while Keselowski took four.

To add insult to injury, he was tagged for speeding on pit road and was forced to serve a drive-through penalty.

The fourth caution of the race flew on lap 99 for a single car spin on the front stretch.

Exiting turn 4, Kurt Busch got loose and spun down the track, through the grass, and came to a stop a few yards from the start/finish line.

Justin Allgaier was tagged for passing before crossing the start/finish line and was forced to serve a drive-through penalty.

While trying to avoid Tony Stewart going into turn 1, Ricky Stenhouse Jr. got loose, tapped Jeb Burton, and sent him spinning.

"[25] Jeff Gordon, following his seventh-place finish in his final start at Kentucky Speedway, said that the tires aren't soft enough.

"[25] "When the sun was out early when everybody's cars weren't dialed in yet, I mean that's the best racing we've had for a while, in my opinion," Carl Edwards said after finishing fourth.

Towards the end of the night, everybody got their cars working, the speeds picked up a little bit and you still got some of that spread-out, really hard to pass, but I'm telling you, this is the way we need to go.

You let Goodyear, give them some time to build a tire for this, cut about half that spoiler off again, you're going to have some awesome racing.

The battle between Kyle Busch and Joey Logano for the race lead and eventual win was as entertaining as anything seen all year.

Goodyear will now have some time to produce a softer tire than what was used at Kentucky for the same rules package in place at Darlington on Labor Day weekend.

Pete Pistone, lead writer for the Motor Racing Network and co-host of the Sirius XM NASCAR Radio weekday program The Morning Drive, described the package as having "provided plenty of reason for optimism," that he saw "more passing for position mid-pack," and that the battle for the win between Kyle Busch and Joey Logano "was as entertaining as anything seen all year.

"[26] Jeff Gluck of USA Today said that "by every measurable category – including the eye test – the debut of NASCAR's low downforce rules package Saturday night at Kentucky Speedway was a whopping success,"[27] and that the package "sure kicked ass..."[28] Lee Spencer of Motorsport.com said that "while it's too early to grade the new low downforce Sprint Cup package, Saturday night's Quaker State 400 was one of the best shows NASCAR has put on at an intermediate track in a long, long time.

"[29] Nate Ryan of NBC Sports described it as "the best Sprint Cup race of a 2015 season lacking for the sort of indelible moments that ran on a continuous loop Saturday night at Kentucky Speedway," and that "there was enough compelling evidence for a strong case the package should get another shot beyond the Southern 500 at Darlington Raceway.

Dave Burns, Mike Massaro, Marty Snider, and Kelli Stavast handled pit road for the television side.

Brad Gillie, Brett McMillan, Jim Noble, and Steve Richards worked pit road for the radio side.