The Buick Regal generally uses Dexos1 Gen 2 motor oil with a viscosity of 5W-30. Always verify the exact specification for your engine and climate in the owner's manual or on the oil fill cap, as requirements can vary by model year and market.
Oil specifications by engine
The Regal has used different engines over its production run in North America. The two most common powerplants are the 2.0-liter turbocharged four and the 2.4-liter naturally aspirated four. For most recent Regal models, both engines typically require Dexos1 Gen 2 oil with a 5W-30 viscosity, though variations can occur by year and region. The following summarizes typical configurations.
- 2.0L turbocharged I4: Dexos1 Gen 2, recommended viscosity 5W-30 (synthetic or synthetic blend) to ensure proper lubrication and performance.
- 2.4L Ecotec I4: Dexos1 Gen 2, recommended viscosity 5W-30 (synthetic or synthetic blend).
Note: Some engines or climates may have different requirements; always verify in the owner's manual, on the oil fill cap, or with a Buick service advisor.
Climate and maintenance considerations
Oil selection can vary with climate and driving conditions. In some markets or for certain model years, GM may specify a slightly different viscosity while still meeting Dexos1 Gen 2, so it is important to follow the exact guidance for your vehicle. Consult your manual or a Buick service professional if you drive in extreme temperatures or have long highway trips, as oil change intervals and viscosity needs can differ from the standard recommendation.
How to verify the correct oil for your Regal
To ensure you are using the proper oil for your specific Regal, follow these steps:
- Check the owner's manual for the exact Dexos specification and viscosity recommended for your engine and market.
- Look at the oil fill cap on the engine for the indicated specification (if provided).
- Ask a Buick dealer or qualified mechanic if you have questions about your VIN-specific requirement.
Using the correct Dexos1 Gen 2 oil helps protect the engine, maintain performance, and comply with warranty requirements. If you are unsure, err on the side of a higher-quality synthetic Dexos1 Gen 2 product and follow the recommended viscosity while confirming with official sources.
Summary
For most Buick Regal models, the standard oil is Dexos1 Gen 2 with a viscosity of 5W-30. Always confirm your exact engine and climate requirements via the owner's manual or a Buick dealership, as variations can exist between model years and regions. Proper oil selection supports engine protection and reliable performance.