When to change the oil on a 2007 Buick Lucerne?

For a 2007 Buick Lucerne, it's generally recommended to change the oil every 3,000 to 5,000 miles if using conventional oil, or every 5,000 to 7,500 miles if using synthetic oil. Additionally, you should refer to the owner's manual for specific guidelines based on your driving conditions and habits. It's also advisable to check the oil level and condition regularly to ensure optimal engine performance.