Question: What kind of car is driven by the current defending winner of the Quaker State 400?

Context articles: 2017 Quaker State 400
2016 Quaker State 400
Quaker State 400
2012 Quaker State 400
Quaker State
2014 Quaker State 400
Martin Truex Jr.
2011 Quaker State 400
2013 Quaker State 400
2015 Quaker State 400

The 2017 Quaker State 400 presented by Advance Auto Parts is a Monster Energy NASCAR Cup Series race held on July 8, 2017 at Kentucky Speedway in Sparta, Kentucky.
 Contested over 274 laps extended from 267 laps due to overtime, on the 1.5 mi speedway, it was the 18th race of the 2017 Monster Energy NASCAR Cup Series season.
The 2016 Quaker State 400 presented by Advance Auto Parts was a NASCAR Sprint Cup Series stock car race held on July 9, 2016 at Kentucky Speedway in Sparta, Kentucky.
 Contested over 267 laps on the 1.5 mi speedway, it was the 18th race of the 2016 NASCAR Sprint Cup Series.
The Quaker State 400 presented by Advance Auto Parts is a 400.5 mi annual Monster Energy NASCAR Cup Series race held at Kentucky Speedway in Sparta, Kentucky.
 The inaugural event was held on July 9, 2011 and was won by Kyle Busch.
 From 2012 to 2014, the race was held the week before the Coke Zero 400 at Daytona International Speedway on Independence Day weekend.
 From 2015 to 2017, the event moved back two weeks, preceding Daytona and New Hampshire, In 2018, the Quaker State 400 will become the 19th race of the season as the New Hampshire 301 at New Hampshire Motor Speedway will become the 20th race of the season.
 Martin Truex Jr., is the defending winner.
The 2012 Quaker State 400 was a NASCAR Sprint Cup Series stock car race that was held June 30, 2012, at Kentucky Speedway in Sparta, Kentucky.
 Contested over 267 laps, it was the 17th race of the 2012 NASCAR Sprint Cup Series season.
 Brad Keselowski won the race, his third of the season.
 Kasey Kahne finished second and Denny Hamlin was third.
Quaker State is an American brand of motor oil produced by SOPUS Products, a division of Royal Dutch Shell, and the successor of the Pennzoil-Quaker State Company.
 The "Quaker State" name is derived from the nickname for Pennsylvania, the state founded by William Penn, a man of the Quaker religion.
The 2014 Quaker State 400 presented by Advance Auto Parts was a NASCAR Sprint Cup Series stock car race held on June 28, 2014, at Kentucky Speedway in Sparta, Kentucky.
 Contested over 267 laps on the 1.5 mi tri-oval, it was the 17th race of the 2014 NASCAR Sprint Cup Series.
 Brad Keselowski led 199 laps during the race, to take his second win of the season.
 Kyle Busch finished second, while Ryan Newman, Matt Kenseth, and Dale Earnhardt, Jr. rounded out the top five.
 The top rookies of the race were Austin Dillon (16th), Michael Annett (18th), and Justin Allgaier (24th).
Martin Lee Truex Jr. (born June 29, 1980) is an American championship professional stock car racing driver.
 He currently competes full-time in the Monster Energy NASCAR Cup Series, driving the No. 78 Toyota Camry for Furniture Row Racing.
 Truex is a two-time Xfinity Series champion; having won the title in 2004 and 2005.
 His younger brother, Ryan is a champion in the K&N Pro Series East division and currently races in the Camping World Truck Series, while his cousin Curtis raced for JR Motorsports.
The 2011 Quaker State 400 was a NASCAR Sprint Cup Series stock car race held on July 9, 2011 at Kentucky Speedway in Sparta, Kentucky.
 Contested over 267 laps on the 1.5-mile (2.4 km) asphalt tri-oval, it was 18th race of the 2011 Sprint Cup Series season, and the first Sprint Cup Series event at Kentucky Speedway.
 The race was won by Kyle Busch for the Joe Gibbs Racing team.
 David Reutimann finished second, and Jimmie Johnson clinched third.
The 2013 Quaker State 400 presented by Advance Auto Parts was a NASCAR Sprint Cup Series stock car race scheduled to be held on June 29, 2013, at Kentucky Speedway in Sparta, Kentucky, United States, but was postponed to June 30 because of persistent rain.
 Contested over 267 laps on the 1.5-mile (2.4 km) tri-oval, it was the seventeenth race of the 2013 Sprint Cup Series championship.
 Matt Kenseth of Joe Gibbs Racing won the race, his fourth win of the 2013 season, while Jamie McMurray finished second.
 Clint Bowyer, Joey Logano, and Kyle Busch rounded out the top five.
The 2015 Quaker State 400 was a NASCAR Sprint Cup Series race held on July 11, 2015 at Kentucky Speedway in Sparta, Kentucky.
 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.
 Kyle Busch won the race, his second of the season.
 Joey Logano finished second.
 Denny Hamlin finished third.
 Carl Edwards and Matt Kenseth rounded out the top five.