In Pixar's Cars, Lightning McQueen's sponsor after he joins the racing team is Rust-eze.
Rust-eze is an imaginary bumper-ointment brand owned by Rusty and Dusty Rust-eze. The brothers discover McQueen during the events surrounding Radiator Springs and offer him a place on their racing team. Their sponsorship supplies the film's recurring red-and-yellow branding and links McQueen to the team that supports his early professional career.
McQueen's larger ambition is to win the Piston Cup and eventually move to the prestigious Dinoco team. Dinoco is a separate sponsor associated with The King, so the two brands should not be treated as interchangeable. The distinction is important to the film's championship plot.
Rust-eze remains part of McQueen's identity across the franchise, even as his relationship with racing, fame, and mentorship changes. The brand is a fictional automotive product created for the Cars world and is not a real commercial sponsor.