Three hits. That’s what it took to turn Chaz Mostert from reigning Supercars champion into the most uncomfortable man in Australian motorsport. Three hip-checks between Turns 2 and 3 at Ruapuna, one of them fatal for Brodie Kostecki’s afternoon and quite possibly for Mostert’s finals campaign, and now a row that’s refusing to go away no matter how many apologies get mumbled through a pit-lane conversation nobody wanted to have.
If you missed the Christchurch Super 440, the short version is this. Kostecki, three points off the championship lead and needing to pass Mostert to snatch the Jason Richards Trophy as top performer across the New Zealand double-header, dived down the inside at Turn 2 on the penultimate lap of Race 13. He got the move done — fairly, by his account, forcefully by most others — and put Mostert onto the grass. Mostert, the #1 Toyota GR Supra looking like a car driven by a man who’d had quite enough of the afternoon, returned serve. Then returned it again. The third touch interlocked wheels and fired Kostecki’s #17 Ford Mustang across the infield, sideways, dust billowing, back onto the racing surface broadside to oncoming traffic. Matt Payne, who led home a Penrite Racing 1-2 up front, called the aftermath “a recipe for disaster.” That nothing worse happened was, to use his phrase, largely luck.
The stewards saw enough. A 30-second in-race penalty — an “in race judge of fact” call, meaning not appealable — dropped Mostert from fourth to 17th. Kostecki, who limped to 18th, lost the championship lead to Broc Feeney and with it the Jason Richards Trophy he’d been chasing. Mostert fell to 11th in the standings, 131 points outside the top ten and five places below his own Walkinshaw teammate Ryan Wood. The reigning champion is, seven rounds into the regular season, outside the Finals Series bubble. That is not where #1 is supposed to live.
And then the talking started, which is where this gets properly interesting.
Mostert fronted the media and apologised “for the outcome,” while simultaneously holding the line that Kostecki’s opening shove at Turn 2 had earned him a response. It was the classic racing driver’s apology — regret without contrition, sorrow without ownership. Kostecki, to his credit, was diplomatic on the broadcast. “Sometimes you’re the bug, sometimes you’re the windscreen,” he said, which is precisely the sort of line drivers rehearse for exactly this situation.
Then came the Lucky Dogs podcast.
Kostecki co-hosts Lucky Dogs with Will Brown — two champions, one studio, a microphone that Supercars PR departments are probably starting to regard as a loaded weapon. Brown, by the way, was the man who swerved across the grass to avoid Kostecki’s stricken car. He was not in a forgiving mood. And Kostecki, two days removed from the incident and with the luxury of not having to answer to broadcast editors, reached for the word he’d been visibly biting back on Sunday.
“Malicious.”
“There’s a difference between hard racing and malicious manoeuvres,” Kostecki said on the podcast. “It’s pretty clear, and I thought it was pretty malicious to be honest. I say this because it’s the second time it’s happened in two weeks. Broc [Feeney] down the straight at Taupo.” He added that Mostert had been “throwing his car at me to try and make me lose momentum,” and that when Mostert sought him out post-race, the Toyota driver had “started having a go” rather than offering a straight apology.
That’s the reigning champion being publicly accused, by a former champion, of deliberately taking another driver off at 190km/h. Into dust. Into traffic. On a circuit where Sam Payne said the margin between “lucky” and “catastrophic” was essentially the angle at which Kostecki’s car rotated.
Craig Lowndes, whose Hall of Fame credentials and seven Bathurst crowns grant him the right to talk down to more or less anyone in the paddock, weighed in via his Supercars.com column yesterday. He sided with Kostecki on the first contact being “aggression and a bit of feeling” — acceptable Supercars fare. He sided with the stewards on the 30-second penalty being fair. But he stopped short of Kostecki’s “malicious” framing. “It’s not normally a Chaz move, he is better than that. It was out of character,” Lowndes wrote. Which is the most Lowndesian thing imaginable: diplomatic, pointed, and absolutely devastating if you’re the one wearing #1.
Here’s what makes this a proper story rather than a ten-minute broadcast talking point. Mostert is winless in 2026. Kostecki has been on the charge, even after dropping from first to third in the championship. Feeney now leads. Kai Allen has rocketed from nowhere to fifth. The Toyota GR Supra — making its championship debut with Walkinshaw TWG and Brad Jones Racing — is supposedly front-running kit, but the reigning champion can’t get it to do what it’s supposed to do. Mostert himself admitted in Christchurch the cars are “super fiddly” and require “almost a perfect car” to extract pace. Translation: he’s struggling, and frustration does predictable things to racing drivers.
The question now is what Mostert does at Symmons Plains on 22-24 May, when the season resumes. Another penalty, another incident, and the whispers stop being whispers. Seven rounds remain before the Finals Series cutoff. The reigning champion currently has to out-drive his own teammate just to make the playoffs. That is the definition of pressure, and pressure, historically, has not made Mostert’s racing any cleaner.
The one thing nobody is disputing is that Kostecki’s spin through the grass was the closest thing Supercars has had to a genuinely dangerous moment in 2026. Brown dodged it. Payne watched it. The flag marshals presumably aged about a decade watching it. If that had gone ten degrees differently, we would not be discussing penalties and podcasts. We would be discussing something considerably worse.
For now, Mostert has apologised for the outcome, not the action. Kostecki has reached for the most serious word available on his own podcast. Lowndes has said it was out of character but over the line. And Tasmania looms, five weeks away, with a reigning champion who needs to remember that the number on the door is meant to mean something rather more than a licence to defend it badly.