In 2018, Nemechek took over as a driver at NEMCO Motorsports after his son John Hunter moved up to the Xfinity Series with Chip Ganassi Racing. He had also been announced as one of the drivers of JD Motorsports' No. 15 car, splitting the ride with other drivers. It was announced that Matt Mills would drive the 15 full time. Nemechek ran the PowerShares QQQ 300 in the 15, and later returned to the car for the Fitzgerald Glider Kits 300.