What kind of engine oil for a 2005 Buick Lesabre?

The 2005 Buick LeSabre's recommended engine oil depends on the engine it has. It likely has either a 3.8L V6 or a less common 3.8L supercharged V6. The owner's manual is the definitive source.

However, generally speaking, for a 2005 Buick LeSabre, you should look for:

* SAE 5W-30: This is the most likely viscosity grade recommended. This oil performs well in a wide range of temperatures.

* API Certification: Look for an API certification symbol (usually a "donut" shape) on the oil bottle. For an older car like this, an "SM" or "SN" rating would be suitable. Anything newer (SN Plus, SP, etc.) is also fine, and likely even better.

* GM-Approved Oil: Ideally, you'd use an oil explicitly approved by General Motors. The bottle may state this.

Before you buy oil, check your owner's manual. It will specify the exact type and viscosity of oil recommended for your specific engine and climate. Ignoring this recommendation can potentially damage your engine.