Tesla Semi's maintenance is very low, with no oil changes or brake fluid changes (due to air brakes).

“The claim is accurate. As a fully electric vehicle, the Tesla Semi has no internal combustion engine and therefore does not require oil changes. Heavy-duty trucks like the Semi use air brake systems, which operate with compressed air rather than hydraulic fluid, eliminating the need for brake fluid. While other maintenance like tire rotations and inspections are still necessary, the elimination of these two major, frequent, and costly service items from diesel trucks supports the claim of very low maintenance in comparison. Context: While the claim is correct about oil and brake fluid, the term "very low maintenance" is relative. The truck still requires routine service for its tires, cabin air filters, and regular inspections of the air brake system and other components, though overall scheduled maintenance is significantly less than a diesel equivalent.”