The 2004 Optima (MS) is a mid-size sedan known for its competitive styling, spacious interior, and strong value proposition. Building on a history as South Korea's oldest motor vehicle manufacturer, the Optima aimed to capture market share against established rivals. For 2004, it received a significant facelift, enhancing its European-influenced design with updated exterior elements and interior refinements. The Optima was offered with a choice of a fuel-efficient 2.4L inline-four engine or a more powerful 2.7L V6 engine, both available with either a 5-speed manual or a 4-speed automatic transmission. This generation was based on the Hyundai Sonata platform and featured a wheelbase of 106.3 inches, contributing to its comfortable passenger volume.

This comprehensive Service and Repair Workshop Manual provides detailed information for the 2004 Optima, covering all trims and engine variants, including the 2.4L Inline-4 and 2.7L V6. With over 1000 pages of content, the manual details essential maintenance procedures, troubleshooting guides, and in-depth repair instructions for all major vehicle systems. Key areas covered include engine mechanicals, fuel, ignition, exhaust, transmission (manual and automatic), drivetrain, suspension, steering, brakes, and the electrical system. It also addresses HVAC, body and chassis, and driver information systems. The manual is designed to assist owners, mechanics, and technicians in maintaining and repairing the vehicle effectively, offering specific torque specifications, tightening sequences, tool requirements, and step-by-step illustrated instructions.