The 1999 Buick Riviera is a personal luxury coupe, a distinguished member of the seventh generation, celebrated for its distinctive styling, comfortable interior, and a potent 3.8L Supercharged V6 engine delivering 240 horsepower. This model, produced at the Detroit/Hamtramck Assembly Plant, embodies Buick's legacy of refined vehicles, offering a smooth ride and a blend of performance and luxury. Its engineering quality is underscored by the inclusion of the highly-regarded V6 engine, a multiple-time winner of Ward's 10 Best Engines. This comprehensive workshop service repair manual provides detailed guidance for all 1999 Buick Riviera models, engines, and trim levels. It covers a vast array of essential information, including routine maintenance, engine and transmission repair, chassis systems like suspension and brakes, and intricate electrical diagnostics. The manual also details bodywork procedures and offers specific technical specifications, fluid requirements, and service intervals. Its purpose is to equip owners, mechanics, and technicians with the knowledge needed to effectively maintain, troubleshoot, and repair this vehicle, ensuring its optimal performance and longevity.