This manual covers all 1940 Oldsmobile models, including various series such as the Series 60, 70, 80, and 90. Oldsmobile, a division of General Motors, was known for its innovative engineering and quality craftsmanship, competing in the mid-range to premium automotive market. The 1940 models featured significant styling updates, with a more streamlined and rounded body design, and offered a range of inline 6-cylinder and 8-cylinder L-head engines. These vehicles were equipped with either a three-speed manual transmission or the groundbreaking Hydra-Matic automatic transmission, representing a significant advancement in automotive technology for the era.

This comprehensive factory-authorized service manual provides detailed procedures for the maintenance, repair, and troubleshooting of all major systems. It covers engine overhaul, fuel and ignition systems, transmission service (both manual and Hydra-Matic), drivetrain, suspension, brakes, and electrical systems. Additionally, the manual includes information on body and chassis work, heating and ventilation, and essential technical specifications such as torque values and clearances. This resource is designed to assist professional mechanics, dealership technicians, and dedicated enthusiasts in maintaining the optimal performance and longevity of their 1940 Oldsmobile vehicles.