The event was held at the Mount Panorama Circuit in Bathurst, New South Wales, Australia and consisted of two 250 km races.
Cameron Hill qualified a career-best fourth and briefly led in the first round of stops, but a mistake at Hell Corner dropped him down the order.
Cam Waters struggled for pace outside the top 20 before losing a wheel late in the race at Griffins' Bend, causing a full course yellow.
At the end of the opening lap, Feeney made a dive on Golding at the Chase but pushed the PremiAir driver off the road – giving the Race 1 winner a pit-stop penalty.
Having led for the opening two stints, Mostert relinquished the lead to Brown in the last pit cycle having suffered from a sticking wheel-nut.