Mostert, who led a front row lockout for Walkinshaw Andretti United in qualifying, followed his team-mate Ryan Wood for the opening 14 laps of the 55-lap race before taking the lead and pacing himself to a 4.9s win over Triple Eight's Will Brown.
Ford's first win, in the ninth race of the season, was determined by pit strategy as well as speed. Brown took four tyres at his mandatory pitstop and four laps later, Mostert took only two. That gave Mostert a gap of five seconds, which he managed to hold to the end of the race.
