The Navistar International VT275 is a diesel engine designed for a wide range of applications, including cars, trucks, and industrial and heavy equipment. This engine is engineered with key components such as a dual turbocharger, exhaust gas recirculation system, gerotor oil pump, and high-pressure oil pump, contributing to its robust performance and reliability. The comprehensive fuel system coverage and focus on all major engine systems underscore the advanced design and intended durability of the VT275. This manual provides an extensive collection of service and diagnostic information for the Navistar International VT275 engine. It includes a detailed service manual covering repair procedures, technical data, and specifications, alongside a comprehensive diagnostic manual for troubleshooting and problem resolution. With a total of 1460 pages across two manuals, this resource offers in-depth guidance on all major engine systems, ensuring owners, mechanics, and technicians have the necessary information to maintain and repair the engine effectively.