This workshop service repair manual covers the BMW 525i, chassis code E28, for the model years 1981 through 1991. Known for its sporty driving dynamics, refined engineering, and robust build quality, the E28 5 Series established BMW's reputation in the executive sedan segment. The 525i, powered by the durable M30B25 inline-six engine, offered a balance of performance and comfort, making it a distinguished choice against competitors of its time. This manual provides comprehensive guidance for maintaining and repairing this iconic vehicle.

This manual is designed to assist owners, mechanics, and technicians in all aspects of vehicle care. It details routine maintenance procedures, including oil changes, filter replacements, and fluid checks, alongside in-depth troubleshooting guides for diagnosing and resolving common and uncommon faults. The manual covers all major mechanical and electrical systems, such as the engine, transmission, brakes, suspension, steering, and electrical components, providing step-by-step repair instructions and essential technical specifications. It also identifies specialized tools required for specific tasks, ensuring accurate and efficient servicing.