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.

It was the Busch Series, Nationwide Series and Xfinity Series. Now, NASCAR has a new name partner for its second-tier circuit.

O'Reilly Auto Parts is replacing Xfinity as the title sponsor of NASCAR's secondary series starting in 2026. NASCAR announced a multiyear partnership on Monday that will become effective on Jan. 1. "Like the great sport of NASCAR,