What brand of muffler and tire oil sponsors Lightning McQueen?

The brand sponsoring Lightning McQueen is Rust-eze. Its full in-universe name is Rust-eze Medicated Bumper Ointment, a deliberately comic product designed for rusty cars.

Rust-eze is McQueen’s sponsor at the beginning of Cars, and its logo is prominently displayed on his red number 95 race car. The company is owned by brothers Rusty and Dusty Rust-eze, who promote their product with McQueen’s image. McQueen initially feels embarrassed by the low-budget sponsor and dreams of replacing it with the prestigious Dinoco team.

The wording can cause confusion because Rust-eze is not literally a conventional muffler or tire-oil company. The fictional brand is a bumper ointment, while Leakless, another answer choice, sponsors a different Piston Cup racer. Dinoco is an oil company and racing sponsor, but it is not McQueen’s original sponsor.

In Cars 3, Rusty and Dusty sell the company to Sterling, who builds the Rust-eze Racing Center. After the Florida 500, Tex Dinoco purchases Rust-eze, linking the two major brands in McQueen’s later career.