Prodrive Racing Australia has decided to make a driver change ahead of the season finale in the No. 6 FG X Ford Falcon,
The No. 5's Enduro co-driver Steve Owen will replace Cameron Waters for the final round of the 2015 championship.
Owen won at Sandown alongside points leader Mark Winterbottom earlier this year.
"It's great to be able to help out the team at the Sydney 500," said Owen.
"I know the cars and I know the team well which always helps. I worked with the guys on the other side of the garage in the endurance races, so working with Adam (De Borre) and the car six crew will be a little bit different but also a great experience.
"The track is a tricky one, you've really got to keep the car clean there because the walls aren't forgiving but I'll give it my best go and hopefully get these guys the team's championship."
The change was made to allow Waters to focus on the Dunlop title fight, where he holds a 149-point advantage over Paul Dumbrell.
"We always wanted to give Cam the best chance possible at taking home his first Dunlop Series Championship and with Steve already being affiliated with the blue cars it was a good fit," said Team Principal Tim Edwards.
"He has been with the team for a little while now and he knows the cars and how the team operates so it just made sense really.
"He did a fantastic job at Sandown and Bathurst and even at the Gold Coast alongside Frosty. He did exactly what we needed him to do which was keep the car clean so we know we can be consistent and competitive at Homebush as well."