Percat's car will carry Coregas as its primary backer, a sister company to the Blackwoods branding which has previously adorned the car.
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“It was fantastic to announce Coregas earlier this year as one of our strategic partners,” said team owner Kim Jones.
“They have been very hands on with trying to improve our productivity and efficiency in the workshop, which has been fantastic.
“Having them on board for this event is pretty special as our very first Supercars event was at Phillip Island, and this weekend we return to where it all began for what will be our 250th round.”
Percat currently sits eighth in the championship standings after the opening three rounds, with two podiums to his name at Round 2 in Albert Park, the highest placed of the BJR's three drivers.
“Phillip Island is one of my favourite circuits on the calendar so I'm looking forward to getting back there,” said Percat.
“We're in a reasonable spot in the championship and it would be fantastic if we can keep the momentum going by getting another good result here.”
At the 2017 event, Tim Blanchard recorded the team's best result with two 15th place finishes.
Percat was a retirement from Saturday's Race 5 after contact in the opening stages before clashing with Alex Rullo with eight laps left.
He then raced to 21st in Race 6 on Sunday, two places behind team-mate Tim Slade.
The Phillip Island 500 gets underway on Friday with two practice sessions.