Defending champion Garth Tander fulfilled on early promise at his new team to be best Holden in fourth position.
Courtney's lead was squandered after a clash in the Senna Chicane while lapping Jason Richards saw a tyre cut and shredded.
Mark Winterbottom led towards the end of the race until a late race safety car period, caused by a clash between HSV Dealer Team teammates Rick Kelly and Paul Dumbrell bunched the field up allowing Whincup, who had earlier had a voltage problem leading to a battery change after 12 laps, to charge through the field, passing Winterbottom with two laps to go to win.
Teammate Craig Lowndes, hampered by a jammed anti-roll bar, finished third behind Winterbottom, with Lee Holdsworth the first Holden home in fourth place.
Fifth place was a career best result for New Zealand teenager Shane van Gisbergen who had only entering V8 Supercar late last year.
[2][3] Two incidents in the two races brought the attention of driving standards for the next round at Eastern Creek, the first was Jamie Whincup.
The new Driving Standards Observer Tomas Mezera received plenty of criticism, because Lowndes already had done a similar move to Winterbottom and Lee Holdsworth a few laps before.