The Swamp Oil 500 is the race held at the Jefferson County Motor Speedway, which Phineas and Ferb enter with their life-size remote-control car, 42, Linda Flynn's beefed up car. ("The Fast and the Phineas")
- The name was likely taken from the name of creator and Major Monogram voice actor Jeff "Swampy" Marsh.
- The Swamp Oil 500 was targeted by Dr. Doofenshmirtz and his Deflatinator Ray.
- Phineas and Ferb's car number is based off of Jeff "Swampy" Marsh's favorite racer, Juan Pablo Montoya, who (at the time) drove the #42 for Chip Ganassi Racing. The Swamp Oil 500 is a parody of NASCAR's season opener The Daytona 500.