Rust-eze is Lightning McQueen's race team sponsor in Pixar's Cars.
Rust-eze is a fictional automotive product company that promotes a rusty-car treatment. Its owners, Rusty and Dusty Rust-eze, discover Lightning and offer him a sponsorship after seeing his potential. The brand's orange-and-white colors become closely associated with Lightning during the first film.
Dinoco is the most important competing sponsor in Cars, and its famous blue race car, The King, represents the prestige Lightning wants. Octane Gain and Mood Springs are other fictional sponsors seen in the film's racing world, which is modeled partly on NASCAR presentation and merchandising.
Lightning's relationship with Rust-eze changes as his career develops. By the end of Cars 3, Rust-eze remains part of the wider racing story, while Lightning takes on a new role helping Cruz Ramirez pursue her own racing career.