This year’s winner, Maranello Motorsport with Supercars stars Jamie Whincup and Craig Lowndes and Ferrari factory driver Toni Vilander got the ball rolling in June.
Defending Supercars champion Shane van Gisbergen starred in a Mercedes, while rivals Mark Winterbottom, Chaz Mostert, Garth Tander, Will Davison, Todd Kelly, Michael Caruso, Lee Holdsworth, Tim Slade and David Reynolds also lined up in 2017.
Teams from Australia, Asia, New Zealand, Europe and the USA have lodged their paperwork before early bird entries close at midnight this Saturday, September 30.
“Early interest has been great and we already have the makings of another world-class field for 2018,” Event Director John Casey said.
“There are more than 40 cars locked in already, including some that we know will surprise people when they are announced.
“Several major outfits are close to firming their plans and rolling out their announcements over the coming weeks.”
Promoted by Supercars Events, Bathurst 12 Hour camping grounds at McPhillamy Park and in the paddock are already sold out, with camp site sales up by 40 percent on 2017.
Sites are still available at Reid Park and Sulman Park, and Tent City at the top of the Mountain, while grandstand seats are also selling quickly.