Dinoco is the racing sponsor associated with The King in Pixar’s Cars.
The King, whose real name is Strip Weathers, is a veteran champion and the blue-and-orange No. 43 car. His Dinoco sponsorship makes him one of the most prestigious figures in the Piston Cup racing world, and Lightning McQueen hopes to win Dinoco’s support during the film.
The sponsor becomes especially important near the ending, when The King is injured during the final race. McQueen chooses to help him instead of taking advantage of the crash, demonstrating the personal growth that defines the film’s conclusion.
Rust-eze is McQueen’s original sponsor, not The King’s. The Piston Cup is the championship trophy and competition, while Octane Gain is another fictional racing brand. Dinoco also appears in other Pixar films, including Toy Story, where it is shown as a gas station brand.