The confirmation sees the squad field the same enduro line-up since 2015.
Mount Panorama will kick off the Pirtek Enduro Cup from October 10-13.
“It's fantastic to be back with the team, and with Scott,” said Luff, who has five career podium finishes at the Bathurst 1000.
“Working with Scotty these last two years has been really enjoyable, we got along really well, and have very similar styles and feedback, so it's a great match.
“To stand on the Bathurst podium the last two years alongside Scott has been amazing, but we desperately want to go one step higher this year.
“The team as a whole made some really strong gains last year, and I have no doubt that will continue into 2019. I can't wait to get back behind the wheel already.”
Meanwhile, Perkins, in his fifth year with the team, also earned a podium finish last year when he and Courtney combined to finish third on Saturday at the Vodafone Gold Coast 600.
“It's awesome for me to be back with JC and the whole Mobil 1 Mega Racing team for another year,” said Perkins.
“There's a real buzz around the workshop and everyone is super keen to get racing this year.
“The new colours look great and the whole team has had a bit of a face lift with Mega coming onboard alongside Mobil 1 – everything looks cool!
“I think the team will only get better from last season, with the second year of the ZB Holden Commodore I'm sure both cars will be pushing for podiums week in week out.
“Bathurst is the big one for us this year, after the heartbreaking DNF there last year, I can't wait for October.”
Co-team principal Mathew Nilsson added, “Having Jack and Warren back is a testament to not only their ability behind the wheel, but the way in which they work with the team, and with James and Scott,”
“They both did a fantastic job last year, their feedback is an asset to the team, and we know how capable they are.
“They are both well suited to their respective partners, and the stability in the relationships is really positive.
“They know how each other work and know what to expect.
“As a team, we are extremely excited to welcome them both back to continue building momentum into the new season.”