Durant co-founded a truck-making subsidiary, Mason Truck, and also acquired numerous ancillary companies to support Durant Motors. In 1927, the Durant line was shut down to retool for a brand-new, modernized car for 1928, re-emerging in 1928 with Durant, Locomobile, and Rugby lines in place, and dropping the Mason Truck and Flint automobile lines and the top-selling Star car in April 1928. In 1929, Locomobile went out of production.
Initially, Durant Motors enjoyed success based upon Billy Durant's track record at General Motors, where he assembled independent makes Chevrolet, Oakland, Oldsmobile, Buick, and Cadillac. However, when sales failed to meet volumes sufficient to sustain Durant Motors holdings, the firm's financial footing began to slip. As a result, Durant Motors began losing market share and dealers. The final Durant-branded models rolled off the US assembly line in August 1931 at Lansing, but continued in Canada into 1932 under Dominion Motors, which also built the Frontenac