International Trucks is the truck-making successor of International Harvester and is today known as Navistar International, headquartered in Lisle, Illinois. The brand carries forward a long history of medium and heavy-duty truck production in the United States.

International is known for engines such as the DT466 and DT466E medium-duty diesel inline-six, the VT365 6.0L V8 diesel, and the MaxxForce diesel family used through the 2000s and 2010s, with later trucks moving to Cummins power. Vehicle lines include the Loadstar and Fleetstar medium-duty trucks along with the DuraStar and ProStar highway tractors.

The manuals sold here cover engine diagnostics, fuel and emissions system service, and the Diamond Logic electrical architecture used across modern International trucks, including complete wiring diagrams. Content also addresses transmission and driveline service, torque specifications, and scheduled maintenance procedures for these commercial trucks.

Whether the job is routine upkeep or a full engine rebuild, these manuals give fleet technicians, independent truck repair shops and owner-operators the factory-level detail needed to diagnose and repair International trucks correctly. Because International trucks are built to run long hours in commercial service, the manuals also detail preventive maintenance schedules, cooling system service and charging system checks, giving technicians a full picture of how the engine, electrical architecture and drivetrain work together on the road. It also explains component testing procedures for sensors and modules within the Diamond Logic system, helping technicians trace faults rather than replace parts unnecessarily.