From the T&C's under Eligible States/Territories
National in Australia and open to residents in the USA, Canada, UK and New Zealand.
Entrants must be over 21 years of age.
The winner must also own a car (meaning have a car in your name within the mentioned countries) and be official licenced to drive.
To claim your prize you will need to provide ID, proof of ownership of your car, ute/truck and a drivers licence for the mentioned countries
The winner agrees to accept either cash up to or equal to $3000 (AUD) or equivalent in local fuel cards.
From the T&C's under Eligible States/Territories
National in Australia and open to residents in the USA, Canada, UK and New Zealand.
Australia is one of the countries in the drop-down list, so it must be valid. They also claim to have been features on the SMH website and on Carsales, so they're definitely relevant to Australia. And they're based in Australia themselves, and the prize specifically says it's AUD$3000 worth of fuel.
Good luck everyone.
Not sure if this comp is open to Australians.
Reading the terms and conditions, nowhere does it say it's for Australians.