|Venue||New Hampshire Motor Speedway|
|Distance||317.4 miles (510.805 km)|
|Previous names||CMT 300 (1997)
Farm Aid on CMT 300 (1998)
Dura Lube/Kmart 300 (1999)
Dura Lube 300 sponsored by Kmart (2000)
New Hampshire 300 (2001-2002)
The Sylvania 300 has traditionally held in mid-September, however, the race has been rescheduled once in its history. (see below)
The Sylvania 300 also has the distinction of being the only Sprint Cup race outside of Daytona and Talladega to run a restrictor plate race since the adoption of the current 358 cubic inch formula. After Adam Petty's fatal crash in the Busch Series practice on May 12, 2000, and Kenny Irwin, Jr.'s fatal crash in the Cup Series practice on July 7, 2000, NASCAR decided to run restrictor plates, already used for the Whelen Modified Tour races at the circuit, for the 2000 Cup race, then known as the Dura Lube 300 sponsored by Kmart. Adding restrictor plates did have the desired result of slowing down the cars drastically, but at the same time, restricted passing so much that Jeff Burton led all 300 laps. This lack of passing was so uncompetitive, that for Cup cars only, the restrictor plates were gone for the very next race, the 2001 New England 300.
From 2004 until 2010, the race served as the opening round of the "Chase for the Sprint Cup", a ten-race "playoff" designed among the top ten (twelve as of 2007) drivers in the standings of the series following the Chevy Rock and Roll 400 to spur interest in a championship series while NASCAR faces competition from the start of the NFL season and college football, the pennant races and post-season of Major League Baseball and the outset of the NHL and NBA seasons. Beginning with the 2011 Chase, the Sylvania 300 will be the second race in the ten-race playoff; as part of a new round of schedule realignment the LifeLock.com 400 at Chicagoland Speedway will move from its traditional early July race date.
It was announced on July 15, 2006 that the title sponsor Sylvania signed an extension until 2012 to be the title sponsor of the race.
2000 Dura Lube 300 Presented by Kmart 
This was the first NASCAR Winston Cup Series race held since the deaths of Adam Petty and Kenny Irwin Jr. at this track. NASCAR used restrictor plates for this race as a result, in an effort to slow the top speed of the cars. However, cautions were so frequent and passing was so slowed that outside polesitter Jeff Burton led all 300 laps. This is the only race to date on a short track that had used restrictor plates. They were not used again after this race.
2001 New Hampshire 300 
The 2001 fall race, originally scheduled for September 16, 2001, was postponed due to the 9/11 terror attacks. Not wanting to cancel the event outright, NASCAR decided to reschedule the race to the next available date. Since there were no scheduled off weeks between then and the end of the season, NASCAR's only option was the weekend of November 23–25, 2001, Thanksgiving weekend.
This created an interesting challenge for Goodyear, the tire manufacturer, as they were not expecting to run a race in New Hampshire in November. With the potential for a much colder raceday than they would've had in September at Loudon, and taking into account the possibility for snow, Goodyear brought a tire that they hoped would be better suited to the cold conditions. NASCAR announced the rescheduled race date would be Friday, November 23, the day after Thanksgiving, to allow for potential weather-related rescheduling. NBC was to carry the race live in the Eastern, Central, and Mountain time zones, with a tape delay for the Pacific time zone to accommodate the third hour of Today.
However, NASCAR's concerns were unfounded as the race was run in unseasonably mild conditions with temperatures in the 50s. NASCAR didn't conduct a traditional qualifying event for this race, instead choosing to employ a modified version of its method used when qualifying is canceled due to weather. To set the field for the race the cars that were holding the top 43 positions in the standings following the September 8 Chevrolet Monte Carlo 400 at Richmond automatically qualified for the race. Only 42 of those cars started the race, as 43rd-place Eel River Racing had folded shortly after the Richmond race.
The race saw Robby Gordon, driving the #31 Lowe's Chevrolet for Richard Childress Racing, win his first ever race in NASCAR, and was marked by an incident in which he and Jeff Gordon got tangled together late in the race which put Robby into the lead. Jeff, who had been running up front all day, hit Robby during a caution flag to retaliate and finished in the middle of the pack (although it was all moot, as Gordon had clinched the 2001 Winston Cup championship at Atlanta the week before).
2003 Sylvania 300 
The 2003 race marked the last time that the long-standing NASCAR rule of racing back to a yellow caution flag was in place. During the race, Dale Jarrett spun and hit the wall in turn 4 and came to rest in the middle of the racetrack's front stretch. Leaders slowed down except Michael Waltrip, who attempted to put several cars a lap down; he and others raced past Jarrett's immobilized car at full speed and some barely avoided contact with him. Beginning with the next race, the MBNA America 400 at Dover, in addition to other rule changes for the Cup, Busch, and Truck series, NASCAR outlawed racing back to the caution. Instead, NASCAR froze the field immediately at the caution and allowed the first car one lap down (or multiple laps down, if there were no cars one lap down) to rejoin the lead lap; this is officially called the "free pass" by NASCAR but is widely known by fans and journalists as the "lucky dog" rule.
2004 Sylvania 300 
The 2004 Sylvania 300 was the first time drivers raced in the Chase for the Nextel Cup format. Everyone was set by points after rain caused the cars to start by points. Jeff Gordon led them down to the green flag. A rivalry started early. Greg Biffle got in the back of Robby Gordon sending Gordon spinning. Later in the race Robby Gordon spun Biffle collecting chase contenders Tony Stewart and Jeremy Mayfield. Gordon was penalized 2 laps for aggressive driving. Kurt Busch won the race and after that year won the championship.
Past winners 
|Year||Date||Driver||Team||Manufacturer||Race Distance||Race Time||Average Speed
|1997||September 14||Jeff Gordon||Hendrick Motorsports||Chevrolet||300||317.4 (510.805)||3:09:45||100.364||Report|
|1998||August 30||Jeff Gordon||Hendrick Motorsports||Chevrolet||300||317.4 (510.805)||2:49:55||112.078||Report|
|1999||September 19||Joe Nemechek||SABCO Racing||Chevrolet||300||317.4 (510.805)||3:09:10||100.673||Report|
|2000||September 17||Jeff Burton||Roush Racing||Ford||300||317.4 (510.805)||3:06:42||102.003||Report|
|2001||November 23*||Robby Gordon||Richard Childress Racing||Chevrolet||300||317.4 (510.805)||3:03:50||103.594||Report|
|2002||September 15||Ryan Newman||Penske Racing||Ford||207*||219.006 (352.455)||2:05:03||105.081||Report|
|2003||September 14||Jimmie Johnson||Hendrick Motorsports||Chevrolet||300||317.4 (510.805)||2:58:41||106.58||Report|
|2004||September 19||Kurt Busch||Roush Racing||Ford||300||317.4 (510.805)||2:53:31||109.753||Report|
|2005||September 18||Ryan Newman||Penske Racing||Dodge||300||317.4 (510.805)||3:18:36||95.891||Report|
|2006||September 17||Kevin Harvick||Richard Childress Racing||Chevrolet||300||317.4 (510.805)||3:06:21||102.195||Report|
|2007||September 16||Clint Bowyer||Richard Childress Racing||Chevrolet||300||317.4 (510.805)||2:52:23||110.475||Report|
|2008||September 14||Greg Biffle||Roush Fenway Racing||Ford||300||317.4 (510.805)||3:00:34||105.468||Report|
|2009||September 20||Mark Martin||Hendrick Motorsports||Chevrolet||300||317.4 (510.805)||3:09:01||100.753||Report|
|2010||September 19||Clint Bowyer*||Richard Childress Racing||Chevrolet||300||317.4 (510.805)||2:58:22||106.769||Report|
|2011||September 25||Tony Stewart||Stewart-Haas Racing||Chevrolet||300||317.4 (510.805)||2:43:13||116.679||Report|
|2012||September 23||Denny Hamlin||Joe Gibbs Racing||Toyota||300||317.4 (510.805)||2:43:02||116.81||Report|
- 2001: Race postponed from September to November due to 9/11.
- 2002: Race shortened due to rain.
- 2010: Clint Bowyer's was found to have illegal car modifications in the post-race inspection, and was penalized 150 points, as well as crew chief Shane Wilson suspended four races.
Multiple winners (drivers) 
|# Wins||Driver||Years Won|
|2||Jeff Gordon||1997, 1998|
|Ryan Newman||2002, 2005|
|Clint Bowyer||2007, 2010|
Multiple winners (manufacturers) 
|# Wins||Manufacturer||Years Won|
|10||Chevrolet||1997, 1998, 1999, 2001, 2003, 2006, 2007, 2009, 2010, 2011|
|4||Ford||2000, 2002, 2004, 2008|
Television broadcasters 
- "Chase Date for Chicagoland?". www.speedtv.com. Retrieved 7 August 2010.
- NASCAR Commentators Crews and Networks
- Sylvania 300 Draws Lowest Rating Ever For Chase For The Cup Race