NASCAR 's secondary racing division, the Xfinity Series , will undergo a name change in 2026 as a result of a new sponsorship deal with O'Reilly Auto Parts. Xfinity has held the naming rights since 2015, but that will change next year to the NASCAR O'Reilly Auto Parts Series.

Originally launched in 1982, the No. 2 racing division below the Cup Series was called the Budweiser Late Model Sportsman Series, before becoming the NASCAR Busch Grand National Series from 1984 to 2002. The name was then modified to the NASCAR Busch Series until it was taken over by Nationwide in 2008. It was then rebranded to the NASCAR Nationwide Series until 2014.

The Xfinity Series has witnessed an impressive viewership growth of around 17 percent in the first year of its partnership with The CW Network, a

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