This manual covers the Mercedes-Benz 300SDL, chassis code W126, for the model years 1986-1987. The 300SDL is powered by a 3.0-liter inline 6-cylinder turbodiesel engine, known for its durability and efficiency. As part of the prestigious W126 S-Class generation, this vehicle embodies Mercedes-Benz's commitment to luxury, engineering excellence, and safety, featuring advanced technologies for its era such as automatic climate control, power-adjustable seats with memory, and an Anti-lock Braking System (ABS). The W126 S-Class set a benchmark for luxury sedans, and the 300SDL variant specifically offered a compelling blend of performance and economy.

This Factory Workshop Service Repair Manual provides comprehensive coverage for all service and repair tasks, from routine maintenance to complete component rebuilds, mirroring the information used by authorized Mercedes-Benz technicians. It includes detailed procedures for the engine, transmission, drivetrain, suspension, steering, brakes, fuel system, cooling system, exhaust system, electrical system, climate control, body, interior, and safety systems. The manual is designed to assist owners and professional technicians in maintaining and repairing the vehicle, offering in-depth repair instructions, troubleshooting guides, diagnostic flowcharts, component replacement procedures, and essential specifications.