The 2004 Buick Regal is a midsize front-wheel-drive sedan designed for comfortable daily driving, long highway commutes, and buyers who want a traditional American ride without a luxury-car price tag. It’s part of the sixth-generation Regal (1997–2004), with 2004 serving as one of the final model years before the Regal nameplate paused in the U.S. market. In its segment, the Regal competed as a value-focused alternative to the Toyota Camry and Honda Accord, leaning more toward soft ride quality, strong V6 power, and a quiet cabin. It’s ideal for drivers who prioritize comfort and straightforward ownership, especially when shopping used.

1) V6 power with two main engine choices: a 3.8L V6 (3800 Series II) in most trims and a supercharged 3.8L V6 (often referred to as 3800 Series II Supercharged) in the performance-oriented Regal GS. The standard V6 is known for smooth torque and easy highway passing. 2) 4-speed automatic transmission paired with front-wheel drive, tuned for relaxed cruising rather than sporty shifting. 3) Comfortable, quiet interior with supportive seating and a driving position that suits taller drivers, plus a large trunk for its class (a strong point for errands and road trips). 4) Available upscale conveniences typical of Buick in this era, including leather seating, automatic climate control, and premium audio on many examples, depending on trim and options. 5) Regal GS models typically add sport-tuned touches (firmer suspension calibration and added performance hardware), making them the most spirited 2004 Regal variant for buyers who want extra acceleration.

When shoppers search “2004 Buick Regal reliability” or “2004 Buick Regal problems,” the Regal generally earns a reputation as dependable for its age, but certain issues show up repeatedly as mileage climbs. Here are some of the most common concerns reported by owners: 1) Intake manifold gasket or coolant leak concerns (often 80,000–150,000 miles). Some 3.8L V6 cars develop coolant leaks from gasket areas or plastic coolant passages. Symptoms can include a sweet coolant smell, low coolant level, overheating, or milky contamination if the leak becomes severe. Catching seepage early helps avoid bigger repairs. 2) Transmission wear and shifting issues (often 120,000–200,000 miles). The 4-speed automatic can develop harsh shifting, delayed engagement, or slipping as fluid ages and internal components wear. Regular fluid service and avoiding overheating are key to longevity. 3) Power window regulator failures and interior electrical quirks (often 80,000–160,000 miles). Owners commonly report windows that move slowly, get stuck, or fall into the door, along with intermittent switch issues. These are usually repairable without major drivability impact. 4) Upper intake, vacuum leaks, and rough idle/Check Engine Light (varies, common past 100,000 miles). Vacuum leaks, aging sensors, or intake-related issues can cause stumbling, lean codes, or inconsistent idle quality. A proper smoke test and scan data diagnosis usually pinpoints the cause quickly.