Rust-eze is Lightning McQueen’s racing sponsor in the first Cars movie.
Rust-eze is presented as a fictional brand of automotive rust treatment, promoted by brothers Rusty and Dusty Rust-eze. Its sponsorship is part of McQueen’s early career and appears prominently in his red racing design. The brand’s distinctive orange-and-yellow logo is one of the recurring visual details in the first film.
McQueen dreams of moving from Rust-eze to the more prestigious Dinoco team. His desire for that sponsorship helps explain his competitive behavior during the Piston Cup season. The rivalry between Rust-eze and Dinoco is therefore connected to McQueen’s ambitions, not just to advertising on race cars.
After the events of Cars, McQueen gains a closer association with Dinoco, but Rust-eze remains an important part of his origin. This is why viewers sometimes answer Dinoco when asked about his original sponsor.