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 track is a road course auto racing facility located in Troy Township, Morrow County, Ohio, United States, just outside the village of Lexington.

[2] Ryan Reed of Roush Fenway Racing would set the fastest time in the session, with a lap of 1:25.829 and an average speed of 94.709 miles per hour (152.419 km/h).

Brendan Gaughan of Richard Childress Racing would set the fastest time in the session, with a lap of 1:32.649 and an average speed of 87.738 miles per hour (141.201 km/h).