The Buick LaCrosse generally uses Dexos1-certified 5W-30 motor oil, with a typical capacity of about 5.5–6 quarts per change. Exact requirements depend on the engine and model year, so always confirm with the owner's manual or under-hood label.
Engine options and oil requirements
The LaCrosse has had a couple of main V6 engines over its production run. The oil must meet GM’s Dexos1 specification (Gen 1 or Gen 2, depending on year). The following outlines the typical oil type by engine family and era.
- 3.8L V6 (2005–2009): Use oil meeting Dexos1 certification (generally 5W-30 synthetic or synthetic-blend); typical capacity about 5.5–6 quarts with filter.
- 3.6L V6 (2010–2019): Use 5W-30 synthetic Dexos1 Gen 2; typical capacity around 5.5–6 quarts with filter.
Note: Exact capacities can vary slightly by transmission and year, so always verify in the owner’s manual or your service documentation.
Additional notes on oil quality and checks
Using oil that meets Dexos1 certification ensures proper engine protection and warranty compatibility with GM vehicles. If you use an oil with a different certification, it may not meet GM’s recommended specification and could affect performance or warranty coverage. When in doubt, follow GM’s maintenance intervals and consult a dealer or trusted mechanic for confirmation.
Summary
In short, a Buick LaCrosse generally takes Dexos1-certified 5W-30 motor oil, with an oil capacity around 5.5 to 6 quarts depending on the engine and model year. Always confirm the exact specification for your vehicle by checking the owner's manual, the under-hood label, or with a dealer service department. Regular oil changes with the correct grade help maintain performance and longevity of the LaCrosse’s V6 engines.