In January, Lowndes peeled back the covers of the Autobarn Lowndes Racing Holden ZB Commodore in which he would compete in 2018, and also confirmed he would once again be partnered by Steven Richards in the Pirtek Enduro Cup. At Tasmania, Lowndes took his first victory in nearly two years, recording the 106th win of his career in the second leg of the 2018 Tasmania SuperSprint. On 5 July, during the press conference at the Townsville 400, Lowndes announced that he will retire from full-time competition at the end of the 2018 championship. He will remain with Triple Eight Race Engineering as an endurance driver. Following up with a written farewell on Twitter. Lowndes finished fourth in both race 17 and race 18. He finished 3rd at Ipswich SuperSprint and 4th at the Sydney SuperNight 300.