The fictional oil company in Pixar's Cars is called Dinoco.
Dinoco is represented by a blue color scheme and a dinosaur logo. In the film's racing world, winning the Piston Cup can lead to a sponsorship deal with Dinoco, making the brand one of the most desirable prizes for competitors. Lightning McQueen initially focuses on gaining that opportunity for himself.
The Dinoco sponsorship is central to the film's final race and to the character arc of The King, a veteran racer nearing the end of his career. After the race, Dinoco's owner, Tex, offers support connected with the result and with Lightning's decision to help The King.
Dinoco is easy to confuse with Rust-eze, the sponsor associated with Lightning McQueen at the start of Cars. Cars 2 introduces another fictional fuel brand, Allinol, while Octane Gain is one of the racing teams represented in the series.