This manual covers the Porsche 928, specifically the 1991 model year, also known as the 928 S4 (facelift). Introduced as a luxury grand tourer, the 928 represented a significant departure for Porsche with its front-engine, rear-wheel-drive configuration and powerful V8 engine. It was engineered to offer a blend of high performance, comfort, and advanced technology, competing with other premium GTs of its era. The 928 was designed with a focus on aerodynamic efficiency and sophisticated engineering, making it a distinctive and capable vehicle for affluent buyers seeking a refined driving experience.

This comprehensive Factory Service Manual provides detailed information for the maintenance, repair, and troubleshooting of your Porsche 928. It covers all major systems, including the engine, transmission, brakes, electrical systems, suspension, and bodywork. Within its extensive pages, you will find step-by-step repair procedures, diagnostic guidance, technical specifications, and essential safety information. This manual is an indispensable resource for owners, mechanics, and technicians aiming to preserve the integrity and performance of their 1991 Porsche 928.