The Porsche 928, produced from 1977 to 1995, was a distinctive luxury grand tourer that represented a significant departure for Porsche. Engineered with a front-engine, rear-wheel-drive transaxle layout for optimal weight distribution, it featured powerful V8 engines ranging from 4.5 to 5.4 liters. The 928 was celebrated for its advanced design, comfort, and high-speed cruising capabilities, aiming to compete with established luxury marques. Throughout its production, it evolved through various iterations including the 928S, 928S2, 928S3, 928S4, 928GT, and the final 928GTS, each bringing performance and styling enhancements.

This comprehensive factory service manual provides in-depth guidance for the maintenance, repair, and troubleshooting of the Porsche 928 models from 1977 to 1995, covering engine variants M28.01 through M28.46 and chassis codes 928 through 928GTS. It details procedures for all major systems, including the V8 engine, manual and automatic transmissions, drivetrain, suspension, steering, brakes, and electrical systems. The manual also covers bodywork, fuel, cooling, and exhaust systems, offering detailed diagnostic information, repair instructions, adjustment procedures, and specifications for special tools, empowering owners and technicians to maintain this complex luxury vehicle effectively.