Buick Lucerne 2006-2011 3.9L Engine Specifications

The 3.9L engine in the 2006-2011 Buick Lucerne is a V6 engine producing 240 horsepower at 6000 RPM and 240 lb-ft of torque at 4800 RPM. It features a cast aluminum block and cylinder heads, with a displacement of 3.9 liters (237 cubic inches). The engine uses sequential fuel injection and is compatible with regular unleaded gasoline. It is paired with a 4-speed automatic transmission and is designed for front-wheel drive configurations. Compatibility with aftermarket parts requires verification of specs and model year.

Regular maintenance for the 3.9L engine includes oil changes every 5,000-7,500 miles using 5W-30 synthetic oil, tire rotations every 7,500 miles, and spark plug replacement every 100,000 miles. The coolant should be flushed and replaced every 50,000 miles, and the transmission fluid should be changed every 60,000 miles. Brake pads should be inspected every 12,000 miles, and the air filter should be replaced every 15,000-30,000 miles. Following the manufacturer's schedule ensures optimal performance and longevity.

To replace the air filter on the 3.9L engine, locate the air filter housing on the driver's side of the engine compartment. Open the housing by releasing the clips or screws. Remove the old air filter and inspect the housing for debris. Install the new air filter, ensuring it is properly seated and aligned. Close the housing and secure it with the clips or screws. Start the engine and listen for any unusual noises to ensure proper installation. Refer to the owner's manual for detailed steps.

Common issues with the 3.9L engine include oil leaks from the valve cover gasket, faulty oxygen sensors, and coolant leaks. To diagnose, check for warning lights on the dashboard, unusual noises, or visible leaks. Use a code reader to retrieve trouble codes if the check engine light is on. Inspect the engine bay for signs of leaks or wear. Consult a repair manual or a certified mechanic for detailed diagnostic procedures and repairs.

To optimize performance, ensure regular maintenance is up to date, including tune-ups and oil changes. Use high-quality fuel and consider upgrading to a performance air filter. Check and maintain proper tire pressure for optimal fuel efficiency. Avoid excessive idling and ensure the cooling system is functioning correctly. Consider aftermarket performance enhancements such as a cold air intake or exhaust system, but ensure they are compatible with the engine and comply with local regulations.