This manual covers the Holden Commodore, specifically models featuring the 5.7-liter V8 LS1 engine produced during the VT, VX, VY, and VZ generations, typically from 1999 to 2007. This powerful aluminum alloy V8 engine, known for its robust performance, delivers approximately 300-350 horsepower and 330-360 lb-ft of torque. Designed for a balance of performance and everyday usability, the Commodore offered both 4-speed automatic and 6-speed manual transmission options, making it a versatile vehicle for various driving needs. Its engineering reflects a commitment to reliability and a distinctive driving experience. This comprehensive workshop service repair manual, written in English, provides essential information for maintaining and repairing your Holden Commodore. It details critical maintenance procedures, including recommended synthetic 5W-30 engine oil, coolant types, and spark plug specifications, along with capacity details for the 5.5 US quart oil system. The manual also covers technical specifications, troubleshooting guidance, and safety protocols. Its purpose is to empower owners, mechanics, and technicians with the knowledge required to ensure the longevity, optimal performance, and safe operation of vehicles equipped with the LS1 engine.