2019 Perth SuperNight

The event was the fifth event of fifteen in the 2019 Supercars Championship. DJR Team Penske's Scott McLaughlin held the championship lead entering the event over teammate Fabian Coulthard and Tickford Racing's Chaz Mostert.

Following the 2018 Sydney SuperNight 300, the SuperNight format was moved to this event with the event reformatted to consist of one race of 120 kilometres held on Friday night and one race of 200 kilometres held on Saturday night. It marked the first time a night race had been held at the circuit.^[4]

The event was open to wildcard entries which saw the grid expand to twenty-five cars. Brad Jones Racing entered an extra Holden Commodore ZB for former-full timer Tim Blanchard, marking his return to the category after retiring at the end of 2018.^[5]

Following a review by the category into parity between models, the Ford Mustang GT underwent changes to its aerodynamics package.^[6] An all new rear-wing endplate design was constructed with the rear-wing gurney flap and undertray also modified with existing parts to fit the new regulations. The changes were completed by the Ford teams in time for the event.^[7]