The Penske Ford driver stretched his points advantage with ease, converting a clean start from pole into a comfortable win.
His job was made even easier when Shane van Gisbergen, who'd run second throughout the first stint, suffered a power steering issue right before making his stop.
The Red Bull Holden driver did try and continue after stopping to swap his regular steering wheel for Triple Eight's famous 'bus wheel' to make the car easier to turn.
However he was quickly black-flagged for the persistent fluid leak.
It's unlikely van Gisbergen would have caught McLaughlin anyway, the Kiwi cruising to a 3.4s win over Cam Waters.
"Awesome. We didn't touch the race car at all from last week. I'm feeling really happy. A bit tired, but all good."
Waters, who ran third behind van Gisbergen in the first stint, did drop behind Jamie Whincup after his stop thanks to taking on three new tyres to Whincup's two.
It didn't take long for the Monster Ford to find a way back through, van Gisbergen's retirement leaving him in second.
He was able to match McLaughlin on the run home, but never looked like hauling the Shell Mustang in.
Chaz Mostert relegated an under-rubbered Whincup to fourth in the second stint as the Walkinshaw driver sealed the final spot on the podium. As a result, Whincup is now 143 points behind McLaughlin in the standings.
Anton De Pasquale and Nick Percat duked it out for fifth, the Erebus driver getting the job done, while Fabian Coulthard climbed his way from outside the Top 10 to seventh.
Van Gisbergen wasn't the only driver struck with power steering issues in the race, meanwhile, with David Reynolds forfeiting a Top 10 spot thanks to a similar issue in Erebus Holden.
|1||17||Scott McLaughlin||Ford Mustang GT|
|2||6||Cameron Waters||Ford Mustang GT||3.490|
|3||25||Chaz Mostert||Holden Commodore ZB||10.816|
|4||88||Jamie Whincup||Holden Commodore ZB||16.008|
|5||99||Anton De Pasquale||Holden Commodore ZB||17.989|
|6||8||Nick Percat||Holden Commodore ZB||27.370|
|7||12||Fabian Coulthard||Ford Mustang GT||29.585|
|8||55||Jack Le Brocq||Ford Mustang GT||30.266|
|9||20||Scott Pye||Holden Commodore ZB||32.539|
|10||44||James Courtney||Ford Mustang GT||34.985|
|11||15||Rick Kelly||Ford Mustang GT||39.590|
|12||14||Todd Hazelwood||Holden Commodore ZB||42.910|
|13||19||Alex Davison||Holden Commodore ZB||43.867|
|14||18||Mark Winterbottom||Holden Commodore ZB||45.084|
|15||35||Garry Jacobson||Holden Commodore ZB||45.468|
|16||5||Lee Holdsworth||Ford Mustang GT||45.763|
|17||2||Bryce Fullwood||Holden Commodore ZB||57.276|
|18||7||Andre Heimgartner||Ford Mustang GT||59.150|
|19||3||Macauley Jones||Holden Commodore ZB||1'01.726|
|20||34||Jake Kostecki||Holden Commodore ZB||1'02.510|
|21||22||Chris Pither||Holden Commodore ZB||1'06.334|
|22||4||Jack Smith||Holden Commodore ZB|
|97||Shane van Gisbergen||Holden Commodore ZB|
|9||David Reynolds||Holden Commodore ZB|
|View full results|