Having beaten teammate Fabian Coulthard to the first corner, McLaughlin had more than a second up his sleeve within the first three laps.
He then eased the advantage over Coulthard out to around 4s across the first stint, before Coulthard made his first stop on Lap 16.
McLaughlin came in three laps later, returning with an almost identical lead. It stayed that way until the second round of stops, too, Coulthard 4.1s down when he stopped again on Lap 37.
Six laps later McLaughlin made his second service, after which the lead really started to blow out. It grew to as much as 8s during the final stint, only for a Lap 58 Safety Car – to recover Will Davison’s broken Mustang – to close the top two right back up.
The five-lap dash to the finish was easy enough for McLaughlin to deal with, though, his winning margin just under a second.
“It’s been an amazing weekend, two wins for our team, a pole and a one-two,” said McLaughlin.
“Our cars were just ridiculously good and I’m excited for the future and the rest of the year.
“We battle hard, we had a little kerfuffle yesterday, we got our butts kicked and came back here today.”
The battle for third was a little more spirited, with Holden drivers Jamie Whincup and David Reynolds scrapping over the final spot on the podium.
For the first two stints it was Reynolds running in third, however that all changed when Triple Eight went for the undercut by bringing Whincup in for a second stop on Lap 33.
Erebus responded by pitting Reynolds a lap later, the Penrite Holden coming out just in front of Whincup. But the seven-time champ wasn’t content with slotting in behind, running side-by-side with Reynolds through the first two corners before barging by on the way into Turn 3.
This all played out well behind the Penske Mustangs, however, with Whincup around 20s behind McLaughlin before that late Safety Car.
Lee Holdsworth finished fifth, helped by a strategic gamble gone wrong for Nick Percat in the closing stages of the race.
The Brad Jones Racing driver had been running ahead of Holdsworth, but elected to pit for fresh rubber when the Safety Car came out with nine laps left.
That dumped him back to 12th, with just five laps after the restart to try and make an impact on better tyres. It wasn’t quite enough, though, Percat only recovering to ninth.
Cam Waters and Shane van Gisbergen finished sixth and seventh, Scott Pye holding off a hard-charging Percat for eighth.
Fresh from a second place on Saturday, Chaz Mostert had an action-packed Sunday. It started when he sprayed his Tickford Mustang at Turn 7 on the first lap while running sixth, rejoining way behind the pack.
He quickly ran down wildcard driver Jack Smith, but had a second excursion while trying to pass the Brad Jones Racing Holden at Turn 3 on the second lap.
His then copped a 15s penalty for contact on James Courtney midway through the race, but, like Percat, gambled on a new set of rubber during the Safety Car and charged his way to 10th.
After the Winton round, McLaughlin leads the standings with an extended margin of 242 points over Coulthard.