After the NASCAR Xfinity Series race on Saturday and the rain delayed Monster Energy Cup Series race on Monday, at Michigan International Speedway, a total of three penalties have been assessed.
In the Monster Energy Cup Series, the Stewart-Haas Racing number 41 car driven by Daniel Suarez and the JTG Daugherty Racing number 37 car driven by Chris Buescher were both found to have a single lug nut improperly installed.
As a result of the infractions, the number 41 crew chief Billy Scott and the number 37 crew chief Trent Owens were fined $10,000 each.
In the Xfinity Series, the race winning number two Richard Childress Racing car driven by Tyler Reddick was also found to have a lug nut improperly secured. Reddick’s crew chief Randall Burnett was fined $5,000 for the infraction.