"Caltex Australia is proud to continue its association with Ross, Tom and the team at Ross Stone Racing through our diesel engine oil brand Caltex Delo," Caltex Australia's Head of Lubricants Marketing, Tony Batt, said.
"Everyone at Caltex Lubricants is right behind RSR in their pursuit of the ECB SuperUtes Championship and are excited to step up to the lead supporters position within the team.
"The RSR Caltex Delo Racing Ute looks fantastic and does a great job in showcasing the Caltex Delo brand.
"We believe that the ECB SuperUtes series is a great category to be involved with as it enables us to demonstrate the proven performance characteristics of the Caltex Delo® range of lubricants."
Isuzu became the sixth brand in SuperUtes when Wilson's D-MAX made its race debut at Winton.
This year's eight-round series starts at the Superloop Adelaide 500 on February 28-March 3.
"Isuzu UTE Australia is excited to be teaming up with one of the most experienced racing teams in Australia, Ross Stone Racing and to partner with Caltex Australia, to compete in the 2019 SuperUtes Series," Mike Conybeare, General Manager of Marketing & PR Isuzu Australia, said.
"We followed the SuperUtes category closely during the maiden year of competition and were impressed with the level of racing displayed and feel that this is a great platform to showcase our three-litre turbo diesel engine in our Isuzu D-MAX.
"We wish Tom and Ross Stone Racing all the best for the upcoming season and hope fans enjoy seeing the Isuzu D-MAX mixing it with some of the best drivers in the country."