Dinoco is the sponsor associated with the Piston Cup race series in Pixar's Cars.
Dinoco is presented as a major fuel and racing brand in the film. Its distinctive blue branding appears on race cars and in the Dinoco-sponsored 1970 Plymouth Superbird driven by The King, a veteran champion voiced by Richard Petty.
The film uses sponsorship to show the difference between established racing fame and Lightning McQueen's emerging career. McQueen wants the Dinoco sponsorship because it represents prestige, popularity, and a place among the sport's biggest stars.
Dinoco is fictional, but its visual identity resembles real-world motorsport sponsors. Rust-eze is a separate fictional bumper-ointment sponsor that supports McQueen at the beginning of the story, while the Piston Cup is the championship competition rather than a sponsor.