V8 Supercar racing will offer a two million Australian dollar cash bonus for any driver who can win its newly-created Grand Slam in a single season.
The Grand Slam includes this weekend's race in Adelaide, the Bathurst 1000, the Gold Coast SuperCarnivale and the final event of the year in Sydney.
The V8 Supercars chairman Tony Cochrane says these four races are considered the hardest events to win and are the key endurance races of the year.
He says it will be an annual prize.
