A Holden race car team will don the rainbow flag in Supercars support races at the Australian Grand Prix in a world-first backed by the inclusive car-maker.

The Commodore V8 racer driven by Brad Jones Racing's Nick Percat will compete at Albert Park in a one-off livery similar to the multi-hued vehicles supplied by Holden for last month's Sydney Gay and Lesbian Mardi Gras.

Holden's rainbow car, running in the supercars races at Albert Park during the Australian Grand Prix carnival.

Despite being identified with the LGBTQI community, BJR say they hope the rainbow motif will promote diversity and equality among people regardless of race, gender or sexual orientation.

Albury-based BJR has changed the design of the colour scheme of Percat's car for the supercars races at the Australian GP to imitate the six-shade look of the Holden Colorado ute that took part in the Mardi Gras parade.