The 2018 Rock N Roll Tequila 170 presented by Amethyst Beverage was the 21st stock car race of the 2018 NASCAR Xfinity Series season, and the sixth iteration of the event. The race was held on Saturday, August 11, 2018, in Lexington, Ohio at the Mid-Ohio Sports Car Course, a 2.258 miles (3.634 km) permanent road course. The race took the scheduled 75 laps to complete. At race's end, Justin Allgaier of JR Motorsports would pass a dominating Austin Cindric from Team Penske with new tires to win his eighth career NASCAR Xfinity Series win and his third of the season. To fill out the podium, Daniel Hemric of Richard Childress Racing would finish third.