This manual covers the Buick Regal, specifically the fifth generation, which was produced from 2011 to 2013. Based on the global Opel Insignia platform, this generation of the Regal introduced a blend of European-inspired design and driving dynamics, offering a refined and engaging experience. It was manufactured in Oshawa, Ontario, Canada. The Regal has a legacy within Buick as a model often positioned in the mid-size or near-luxury segment, known for comfort and appointment. This particular generation is noted for its robust safety features, earning a Top Safety Pick designation and achieving 5-star ratings. This comprehensive Factory Workshop Service Repair Manual provides extensive coverage for the 2011-2013 Buick Regal. It details numerous systems, including Powertrain, Chassis, Body and Exterior, Interior and Comfort, and Electrical and Electronics. The manual encompasses a wide array of procedures, from routine maintenance and diagnostics to complex repair and rebuild tasks. It is designed to assist professional automotive technicians, DIY enthusiasts, and Buick Regal owners by offering factory-level detail, high-resolution illustrations, and detailed wiring diagrams, ensuring accurate and effective vehicle maintenance and repair.