Every film production puts certain brand names on screen. On the one hand, the production gets money for the brand to promote its product. On the other hand, the brand hopes to sell more products with this form of advertising and therefore make money.
In an animated feature this kind of practice is unusual. Pixar has nevertheless come up with brand names you can sometimes see in several of its features, as well as company names.
Dinoco is an oil company.
The brand was most likely created by the “Sinclair Oil Corporation”, which uses an Apatosaurus as its logo.
In Toy Story, Dinoco Gas Station is where Woody and Buzz argue and the Space Ranger reveals the purpose of his mission. They will find the Pizza Planet van to get back to Andy. In Toy Story 2, Al was originally meant to stop at the filling station following mechanical problems when he leaves for the airport.
In Cars and Cars 2, the Dinoco oil company is both a racing team and sponsor of the Piston Cup. The brand can be seen at every race through hoardings positioned at the side of the track. Tex runs the company and wishes to promote values (good sportsmanship, honesty…) through his driver. Blue is the prevailing colour, and you can see that Dinoco has a lot of money : several haulers, a helicopter, cheerleaders… which make it a competitive team in the race.