The 1999 Buick Park Avenue is a full-size luxury sedan, model code M, built on the G-body (GMT130) platform. This vehicle was engineered to offer a premium driving experience, characterized by a comfort-oriented ride, a spacious and quiet interior, and available V8 engine options. Notable features for its time included optional Magnasteer variable-assist steering and StabiliTrak stability enhancement, reflecting Buick's commitment to refined performance and advanced technology for its segment. The Park Avenue was designed to provide a quiet, comfortable, and reliable mode of transportation, appealing to drivers seeking a sophisticated and well-appointed vehicle. This workshop service repair manual provides comprehensive coverage of all systems and components for the 1999 Buick Park Avenue. It details routine maintenance procedures, diagnostic strategies, troubleshooting guides, and step-by-step instructions for component removal, installation, and repair. Technical specifications, torque values, fluid capacities and types, and wiring diagrams are included to assist owners and technicians. The manual aims to empower users to effectively maintain, diagnose, and repair their vehicle, ensuring optimal performance and longevity.