This manual covers the 1940 Oldsmobile 88, a mid-to-upper tier passenger car known for its sleek styling and the introduction of the Hydra-Matic automatic transmission. Oldsmobile, founded in 1897 and acquired by General Motors in 1908, produced approximately 327,000 vehicles in 1940, with the 88 line being a significant contributor. The 1940 88 was a notable advancement, featuring an L-head inline-eight engine, often referred to as the 'Rocket' engine, which offered improved performance and smoothness. This model represented a key step in automotive development, contributing to the mainstream adoption of V8 engines and automatic transmissions.

This comprehensive service and repair manual is designed for professional technicians. It provides detailed information on all major vehicle systems, including the engine, cooling, fuel, ignition, lubrication, transmission, clutch, drivetrain, suspension, steering, brakes, electrical system, and body. The manual includes step-by-step procedures for maintenance, repair, overhaul, and adjustments, along with essential technical specifications, diagnostic charts, and troubleshooting guidance. Its purpose is to ensure the proper upkeep and repair of the 1940 Oldsmobile 88, maintaining its operational integrity and performance.