Like his boss Luigi, Guido is an avid Ferrari racing fan who dreams of performing a real pit stop on a real race car. To better prepare himself, he practices tire changes at night on wooden practice frames he built in his garage. One of these days, he hopes to set a new world record for the fastest pit stop of all time. But until that happens, he continues his quest to further enlighten himself. Currently, Guido is reading Tire Changes for the Soul, and Four Tires, One Goal.
Guido ultimately realizes his dream when he works on Lightning McQueen's pit crew under the command of Doc Hudson. Guido deals with the derisive attitude of Chick Hicks' pit crew by single-handedly changing McQueen's tires in record time, something not even four experienced pit crewmen could do.
Guido isn't just pretty fast with a tire, he's pretty creative with one too, or even with ten.
Guido, the little Italian forklift, is the backbone of Casa Della Tires. He's Luigi's assistant and best friend, and together they are the biggest Ferrari racing fans in Carburetor County. A car of few English words other than "pit stop," Guido is a force to be reckoned with when he's changing tires in the pits during a race. Joining Team Lightning McQueen for the World Grand Prix, Guido will get to show off his turbo-charged, pedal-to-the-metal pit stops on the global stage...and maybe, just maybe, he'll see some Ferraris!
In this film, Guido and Luigi tag along with McQueen as his pit crew. He is seen serving drinks at the beginning of the film. He also watches as Mater talks on the Mel Dorado Show. Later in Tokyo he doesn't believe that Holley Shiftwell is Mater's girlfriend until the end of the film when she says it herself in a jaw-dropping moment. Uncle Topolino reveals the Guido and Luigi used to always fight and they are seen fighting over a girl car until another girl car comes and they are both satisfied. He also helps fight the lemons later in the film. He tries to take off the bomb that was attached to Mater, but his drill won't do it and he gets frustrated and leaves.