Rust-eze is Lightning McQueen's racing sponsor in Pixar's Cars.
Rust-eze is a company that sells a bumper ointment portrayed as a treatment for rust. The sponsor's branding appears on Lightning's body and is central to his early career. Lightning initially regards the Rust-eze team as an embarrassing step toward a Dinoco contract, but his experiences in Radiator Springs change his attitude.
The Rust-eze founders, Rusty and Dusty Rust-eze, are elderly cars who support Lightning during the Piston Cup season. Their sponsorship gives him his first major opportunity even though he does not appreciate it at the beginning.
Dinoco is a different racing sponsor associated with The King and later connected to Lightning's ambitions. The Piston Cup is the championship trophy, not a sponsor, while RPM is another racing team brand seen in the film.