Quaker State 400 (Kentucky)

Cole Custer won the last running of the event in 2020; the race date was returned to Atlanta Motor Speedway in 2021.

The event eventuated following a lawsuit in which Kentucky Speedway claimed NASCAR had violated federal antitrust laws in 2005.

[2] Seven months later, Royal Dutch Shell's Quaker State brand was announced as sponsor and the 267 lap[3] race held on July 9, was won by Kyle Busch.

[8] "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 will be in effect for the 18th round of the 2015 NASCAR Sprint Cup Series.