Buick Regal: Selecting the Right Engine Oil - Engine Oil - Vehicle Checks - Vehicle Care - Buick Regal Owners ManualBuick Regal: Selecting the Right Engine Oil

Selecting the right engine oil depends on both the proper oil specification and viscosity grade:

Specification (Except 2.0L Turbo Engine)

Use and ask for engine oils with the dexos™ certification mark. Oils meeting the requirements of the vehicle should have the dexos certification mark on the container.

This certification mark indicates that the oil has been approved to the dexos specification.

This vehicle was filled at the factory with dexos-approved engine oil.

This vehicle was filled at the factory with dexos-approved engine oil.

Notice: Use only engine oil that is approved to the dexos specification or an equivalent engine oil of the appropriate viscosity grade. Engine oils approved to the dexos specification will show the dexos symbol on the container. Failure to use the recommended engine oil or equivalent can result in engine damage not covered by the vehicle warranty. If you are unsure whether the oil is approved to the dexos specification, ask your service provider.

Use of Substitute Engine Oils if dexos is unavailable: In the event that dexos-approved engine oil is not available at an oil change or for maintaining proper oil level, you may use substitute engine oil displaying the API Starburst symbol and of SAE 5W-30 viscosity grade.

Use of oils that do not meet the dexos specification, however, may result in reduced performance under certain circumstances.

Specification (2.0L Turbo Engine)

Use and ask for engine oils with the dexos certification mark. Oils meeting the requirements of the vehicle should have the dexos certification mark on the container.

This certification mark indicates that the oil has been approved to the dexos specification.

This vehicle was filled at the factory with dexos-approved engine oil.

This vehicle was filled at the factory with dexos-approved engine oil.

Notice: Use only engine oil that is approved to the dexos specification or an equivalent engine oil of the appropriate viscosity grade. Engine oils approved to the dexos specification will show the dexos symbol on the container. Failure to use the recommended engine oil or equivalent can result in engine damage not covered by the vehicle warranty. If you are unsure whether the oil is approved to the dexos specification, ask your service provider.

Use of Substitute Engine Oils if dexos is unavailable for top-up only: Engine oil not meeting the dexos specification or equivalent should not be used for an oil change. In the event that dexos-approved engine oil is not available for maintaining proper oil level, however, you may use substitute engine oil displaying the API Starburst symbol and of SAE 5W-30 viscosity grade.

Extensive use of oils that do not meet the dexos specification, however, may result in reduced performance or engine damage under certain circumstances.

Maintaining the proper oil level is very important. However, if you use a substitute oil for any reason, we recommend that you perform a complete oil change back to dexos as soon as possible to protect the engine and maintain the engine's peak performance.

Viscosity Grade

SAE 5W-30 is the best viscosity grade for the vehicle. Do not use other viscosity oils such as SAE 10W-30, 10W-40, or 20W-50.

Cold Temperature Operation: In an area of extreme cold, where the temperature falls below −29°C

Cold Temperature Operation: In an area of extreme cold, where the temperature falls below −29°C

(−20°F), an SAE 0W-30 oil should be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. When selecting an oil of the appropriate viscosity grade, be sure to always select an oil that meets the required specification, dexos. See “Specification” earlier in this section for more information.

    When to Add Engine Oil
    If the oil is below the cross-hatched area at the tip of the dipstick, add 1 L (1 qt) of the recommended oil and then recheck the level. See “Selecting the Right Engine Oil” in this section for ...

    Engine Oil Additives/Engine Oil Flushes
    Do not add anything to the oil. The recommended oils with the dexos specification and displaying the dexos certification mark are all that is needed for good performance and engine protection. Engine ...

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