Buick Terraza 2005-2007 3.5L Engine Specifications

The 3.5L engine in the 2005-2007 Buick Terraza is a V6 engine producing 200 horsepower at 5,600 RPM and 220 lb-ft of torque at 3,200 RPM. It features a cast aluminum block and cylinder heads, with a dual overhead camshaft design. The engine utilizes sequential fuel injection and is compatible with regular unleaded gasoline. It is paired with a 4-speed automatic transmission and is designed for reliable performance in both city and highway driving conditions.

Regular maintenance for the 3.5L engine includes oil changes every 5,000 miles using 5W-20 synthetic oil, tire rotations every 7,500 miles, and spark plug replacements every 100,000 miles. The coolant should be changed every 50,000 miles, and the air filter should be replaced every 15,000 miles or as needed. It is also recommended to inspect the belts and hoses every 50,000 miles and replace them if signs of wear are present.

To replace the engine oil and filter, start by warming up the engine, then locate a suitable drain surface. Jack up the vehicle and remove the oil drain plug, allowing the oil to drain completely. Replace the oil filter with a new one, then refill the engine with the recommended 5W-20 oil (approximately 5 quarts). Replace the oil drain plug, lower the vehicle, and dispose of the used oil and filter responsibly. Refer to the service manual for detailed instructions.

Common issues with the 3.5L engine include rough idling, decreased fuel efficiency, or overheating. To troubleshoot, check the PCV valve for proper function, inspect the coolant level and condition, and ensure the air filter is clean. If issues persist, scan for trouble codes using an OBD-II scanner and address any codes that appear. Consult a professional mechanic if problems are severe or persistent.

To optimize performance, ensure regular maintenance is up to date, including clean air filters and proper oil changes. Consider upgrading to a high-performance air intake system and exhaust system for improved airflow. Use high-octane gasoline for better fuel efficiency and performance. Additionally, tuning the engine with a performance chip can enhance power output, but ensure compatibility and consult a professional before making modifications.