Within the early phases of the race it a battle between front-row starters Cam Waters and Scott Pye.
Waters led Pye throughout the primary stint, the hole steadily rising to round 2.5s earlier than Pye took his first cease on lap 24.
Waters adopted swimsuit two laps later, the Tickford driver resuming with a snug margin over Pye – solely to just about throw it away on lap 28 when he clipped the wall at Flip 11.
That put Pye proper below his rear wing, Waters defending into the final nook as Pye ran broad making an attempt to get previous.
Shane van Gisbergen was one other driver that appeared within the hunt early on with a stirring drive from the again of the grid.
He labored his method into the High 10 inside 12 laps and was well-placed, with loads of gas, in eleventh after his first cease.
Nonetheless a lap 38 security automotive, sparked by Jack Le Brocq burying his Holden within the tyre wall at Flip 11, modified the complexion of the race.
Nearly all of the sphere hit the lane for a second cease, the likes of Waters and Pye falling simply wanting clearing the 140-litre minimal gas drop.
That meant they would want a 3rd cease, whereas Mostert, Nick Percat (who stopped twice behind the protection automotive) and James Courtney have been amongst these to squeeze sufficient gas in to fulfill the rules.
There was nonetheless a query mark over their gas, although, with loads of saving required to get dwelling.
When the race went inexperienced on lap 41 van Gisbergen’s hopes unravelled because of an unsuccessful go try on Mostert as they battled over what was successfully fourth place.
The Kiwi tried to go across the exterior at Flip 6, the pair making side-by-side contact that led to van Gisbergen nosing into the wall.
The delay dropped van Gisbergen all the way in which again to nineteenth on the street.
Waters, in the meantime, scrambled to clear the non-stoppers, getting by means of Chris Pither on Lap 45 after which Lee Holdsworth three laps later.
As soon as in entrance he bolted in an effort to place a margin on Mostert realizing he wanted that third cease.
The cost was short-lived, each Waters and Pye diving again into the lane on Lap 50 when the protection automotive was known as as a consequence of one other van Gisbergen blunder.
Photograph by: Edge Photographics
This time he ended up within the wall at Flip 11, van Gisbergen capable of again himself out, however would later retire because of the harm.
With Waters, Pye and Anton De Pasquale all stopping Mostert discovered himself within the lead for the Lap 52 restart – however needing to save lots of gas to get to the end.
Waters, in the meantime, dropped again to eighth in queue, and misplaced extra spots on the restart when he out-braked himself into Flip 4.
As he desperately tried to get better he clashed with Todd Hazelwood at Flip 5, Hazelwood gathering the wall earlier than being hit within the passenger facet door by Will Brown.
That prompted a 3rd security automotive which gave chief Mostert some respiratory room by way of gas.
It additionally ruined Waters’ race because of a drive-through penalty for his function within the crash.
The race went inexperienced once more on lap 58, Mostert surviving a quick problem from Andre Heimgartner, who had filtered as much as second, earlier than settling into the lead.
Even higher for Mostert was that Percat managed to get previous Heimgartner and into second.
A well-fuelled Pye was nonetheless a contender on the restart, just for his hopes to go up in smoke when he was hit by Bryce Fullwood and brought out of the race at Flip 9.
With the early contenders out of the working, and the protection of his teammate as rear gunner, Mostert was capable of cruise by means of the ultimate stint of the race and rating a fairytale win for Holden’s most well-known workforce on the model’s closing weekend in Supercars.
It was additionally Mostert’s first win on the enduring Adelaide circuit.
“A superb outdated basic gas race, who knew that was in retailer,” stated Mostert.
“I struggled with the automotive most the race, it was fairly edgy on the market. I needed to get my elbows out with a number of folks. It was a tricky race.
“It is so good to get a one-two. It is simply onerous work and dedication.”
Whereas Heimgartner dropped out of competition with cramps, Percat discovered himself below stress from Courtney throughout the ultimate stint.
However the hometown hero was capable of maintain the Tickford Mustang off to safe the WAU one-two.
Brodie Kostecki completed fourth forward of Tim Slade and Mark Winterbottom.
Will Davison ended up as the perfect of the Shell Fords in seventh adopted by Broc Feeney, Heimgartner and Holdsworth.
The Adelaide 500 continues tomorrow with qualifying for Race 2 at 10:50am.