Brodie Kostecki has used a post-weekend podcast appearance to significantly harden his stance on Chaz Mostert's Christchurch defence, explicitly labelling the Walkinshaw Andretti United driver's repeated bumps as 'malicious' and dismissing the idea that the contact fell within the normal boundaries of hard racing.
The reigning Supercars champion had already scored a comeback Sunday win at Ruapuna after the Saturday flashpoint, but the follow-up public commentary from Kostecki makes clear that the #17 garage views Mostert's conduct as something rather more serious than an over-zealous defence of track position.
Speaking on the Lucky Dogs podcast, Kostecki distinguished between his own opening contact — where he tagged Mostert's side at Turn 2 while chasing fourth place — and the sequence that followed, in which Mostert bumped him repeatedly at Turn 3 and pitched him off the track. Kostecki finished the race 18th; Mostert took the chequered flag fourth on the road before losing the position, and five more, after stewards handed down a 30-second post-race penalty.
"There's a difference between hard racing and, like, malicious manoeuvres," Kostecki said. "I thought it was probably pretty malicious, to be honest."
He then expanded on the distinction he is drawing — a framing that shifts the argument from race-craft judgement to driving standards and responsibility.
"We all have lapses of judgement at times," Kostecki said. "But there's a difference between a lapse in judgement and the malicious side."
That tone matters because it is the second time in as many weekends that Kostecki has pointed to a similar pattern of contact. He made a reference in the podcast to last round's controversial incident with Broc Feeney at Taupo, where wheel-to-wheel contact again sent his #17 Dick Johnson Racing entry off the racing line. Taken together, the two incidents form the backbone of Kostecki's implicit argument that he is being singled out for harder treatment than his championship position should warrant.
It is an argument Walkinshaw Andretti United will not take quietly. Mostert insisted after the race that his Turn 3 move was a legitimate response to the initial contact at Turn 2. And his own recent public commentary, earlier this month, framed his rivalry with both Triple Eight and Dick Johnson Racing as a deliberate reset — describing himself as "keeping scores" on incidents he felt had gone his opponents' way.
What Mostert has yet to do is publicly rebut Kostecki's use of the word 'malicious' directly. The stewards' 30-second penalty — a severe sanction that dropped him from fourth to 17th — is an operational verdict on the contact, but it does not settle the driving-standards question Kostecki is now trying to force into the open.
The championship picture complicates the narrative further. Kostecki sits second in the standings heading into the Hidden Valley weekend, while Mostert is ninth after a mixed start to the campaign. A Kostecki-Mostert collision that costs Mostert a top-four result does measurable championship damage; for Kostecki's title defence, the gain in recovery points is offset by the risk of sustained confrontations with a veteran driver who has just publicly declared a keeping-scores mindset.
Supercars' driving standards panel will not intervene again on the basis of Kostecki's podcast comments alone — the penalty has been handed down and the appeal window passed — but the broader question of where the line sits between a 'lapse in judgement' and a 'malicious manoeuvre' has been thrown open at exactly the moment the championship sets off for Darwin.
If Kostecki is right that a pattern is forming, stewards and the drivers' representative body will feel pressure to clarify the threshold before the next flashpoint arrives. If Mostert is right that the Christchurch move was a reasonable racing response, the reigning champion's decision to escalate the rhetoric will have simply lit a longer fuse on a rivalry that now looks set to define the 2026 Supercars season.
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*Originally published on [Motorsports Global](https://motorsports.global/article/kostecki-doubles-down-mostert-christchurch-move-was-malicious). Visit for full coverage.*