2015 International V8 Supercars Championship

[2][3][4] Ford reduced its commitment as a prelude to a complete exit from the series at the end of the season,[5] while Mercedes-Benz continued to be represented without any factory support.

[69] Each Super Sprint event featured two hours of Friday practice which incorporated testing time for the teams.

The amount of track time on Fridays at eight rounds has been increased to account for the reduced number of test days.

[76] Jamie Whincup began his title defence in a strong manner, taking pole position for both of the Saturday races.

[78] Whincup dropped down the order in the second race due to a puncture, while Coulthard took victory with James Courtney and Craig Lowndes rounding out the podium.

[79] Courtney won the final race of the weekend on Sunday ahead of Shane van Gisbergen and Garth Tander.

[86] Chaz Mostert took his first V8 Supercar pole position when he qualified fastest for the first race of the Ubet Perth Super Sprint.

The session saw Lee Holdsworth make a mistake at turn six and his car rolled onto its side after digging into the sand trap.

[90] Despite starting off the front row, Mostert and Winterbottom finished fourth and 15th respectively after their tyre strategy was ruined by a safety car on lap 48.

Will Davison won the race, taking Erebus Motorsport's second ever victory, after passing Lowndes for the lead with five laps remaining.

[92] Winterbottom won the second race of the weekend, with Rick Kelly scoring another podium for Nissan Motorsport, while Mostert finished in third place after starting from pole.

[94] Mostert was leading at the halfway mark of the race when he dropped his left-rear wheel onto the grass on the entry to turn four, causing him to spin into the tyre wall.

[97] Lowndes recovered in the second race to score his 100th career victory in the Australian Touring Car Championship and V8 Supercars, becoming the first driver to reach the mark.

Rick Kelly had qualified on pole position for the first time since 2011 but collided with Fabian Coulthard at the first corner and received a drive-through penalty.

A delaminated tyre for Lowndes towards the end of the race dropped him to fifteenth, allowing Winterbottom to extend his championship lead to 95 points.

[100] Fabian Coulthard finished third while Mostert drifted to eighth late in the race due to a rear suspension problem.

With Craig Lowndes and Fabian Coulthard both experiencing difficulties during the weekend, Winterbottom left the event with a championship lead of 248 points.

Jason Bright suffered heavy damage at the first corner of the race, running into the back of David Wall who slowed after Dale Wood spun Todd Kelly.

[108] James Courtney was ruled out of the Sydney Motorsport Park event following Friday practice, where he was hit by a piece of pit equipment which had been flung into the air by a low-flying helicopter.

[110] Dale Wood was penalised for reckless driving after deliberately running into Nick Percat on the slowdown lap after the race.

[114] Prodrive Racing Australia scored a one-two finish at the Wilson Security Sandown 500, with Mark Winterbottom and Steve Owen taking victory ahead of teammates Chaz Mostert and Cameron Waters.

[117] Chaz Mostert was ruled out for the remainder of the season after sustaining leg and wrist injuries in a major accident during qualifying for the Bathurst 1000.

[118] The race was won by Craig Lowndes and Steven Richards, who took their sixth and fourth victories respectively, while Mostert's teammates, Mark Winterbottom and Steve Owen finished second.

[119] David Reynolds had qualified on pole position, setting the fastest time in a rain-affected Top Ten Shootout,[120] but he and Dean Canto could only finish sixth.

[119] The safety car had been brought on to the track after Scott Pye crashed heavily at the top of the circuit, suffering a fractured rib.

[119] James Courtney returned from injury at the Castrol Gold Coast 600, driving in a race for the first time since the Coates Hire Ipswich Super Sprint.

Mark Winterbottom had a difficult weekend, allowing Craig Lowndes and David Reynolds to reduce his championship lead.

Whincup won from pole position in the first race with Shane van Gisbergen and David Reynolds completing the podium.

Scott Pye originally finished in fourth place but was relegated to fifth after cutting a chicane in the closing laps to keep ahead of Craig Lowndes.

Championship leader Mark Winterbottom endured a difficult race, being spun early on before recovering to finish in eleventh place.