NASCAR Cup Series at Dover Motor Speedway

Stock car races in the NASCAR Cup Series were held annually at Dover Motor Speedway in Dover, Delaware since 1969 to 2025. The race was named Autotrader EchoPark Automotive 400 for sponsorship reasons.

From 1971 through 2020, a second Cup race was held at Dover in the fall.

The 2020 race was postponed to August due to the COVID-19 pandemic and became a doubleheader with the second race. Both events were named the Drydene 311 as their race lengths were shortened. For 2021, the race length was restored to 400 miles.

The second race was part of the NASCAR playoffs from their start in 2004 until 2020, when the race was moved to the penultimate weekend of the regular season. The race was left off of the schedule in 2021 as Dover Motorsports, the track's owner, elected to move one of its two dates to Nashville Superspeedway as part of a schedule realignment.

Alex Bowman won the race in 2021 as part of a historic 1-2-3-4 finish for Hendrick Motorsports.

In September 2021, RelaDyne bought the Drydene brand which was the title sponsor of the race. The company added another one of their brands, DuraMAX, to the title sponsor of the race. RelaDyne was also included in the name of the race as a presenting sponsor. As a result, in 2022, the name of the race became the DuraMAX Drydene 400 presented by RelaDyne. In 2023, Würth, which has been a sponsor on Team Penske's NASCAR Cup and Xfinity Series cars for a few races each year since 2012, became the title sponsor of the "Monster Mile" race.