2009 BUICK Lucerne LZ4/LH8 (GMX166)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Timing chain stretch on LZ4 3.8L engine
• Transmission solenoid failures
• Power steering fluid leaks

First checks

• Check oil level and condition
• Inspect timing chain noise
• Monitor transmission shifting behavior

Avant de remplacer des pièces

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• The Buick Lucerne was primarily sold in North America; some Latin American countries received this model via export.
• No official sales or production documented for other global markets in 2009.
• Engine oil capacity includes filter change; always verify specification in owner's manual or service guide.