After successfully campaigning a Class C Porsche last year, the entry is now a full GT3 Pro-Am entry using a Mercedes AMG.
The car will be entered by Scott Taylor Motorsport and run by Ash Seward Motorsport, with Lowndes joined by Alex Davison and Geoff Emery in the driver line-up.
The Mercedes will carry STM's regular black and green colours, with PCFA signage on the doors and bonnet and the #GetChecked hashtag on the rear wing.
The Bathurst 12 Hour will take place on February 3-5.