It proved an excellent breakthrough win for Tim Slade, who took over from Kiwi Fabian Coulthard at Brad Jones Racing.
He became the ninth different winner from 10 races this season, to illustrate the competitive nature of the field this year.
Slade cleared out from the pole position and was never threatened as McLaughlin and three former champions in Winterbottom, Rick Kelly and Jamie Whincup battled for the podium.
"Tim's a good mate of mine and it's his first win. He's been waiting a long time. It's awesome to see and I am stoked for him," said McLaughlin.
McLaughlin made his move off the line, jumping superbly from fourth on the grid to beat a stuttering Winterbottom into the first corner. From there it was a matter of getting the tactics right on the tight track that offered few passing opportunities.
McLaughlin leads the championship on 984 points from Whincup on 1963, Craig Lowndes 954 and Winterbottom 945.
While it was a celebration for the young Kiwi driver, it proved a lack-lustre day for the rest of the New Zealand drivers who struggled to come to grips with the resurfaced Winton Raceway.
Shane van Gisbergen, fresh back in Australia after racing in England last weekend, finished ninth after qualifying 11th, Coulthard finished 17th from 15th on the grid, one place ahead of Chris Pither in the Super Black Racing entry with Andrew Heimgartner 23rd.
Van Gisbergen retains fifth place in the championship with Coulthard 16th, as the Kiwi drivers chase more competitive machinery ahead of Sunday's 200km race.