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What type coolant is recommended by the manufacturer for a 2001 Buick Regal?

The 2001 Buick Regal's owner's manual will specify the recommended coolant. However, generally speaking, for that year and model, Dex-Cool (or a compatible DEX-COOL type coolant) was likely recommended.

It's crucial to check your owner's manual. Using the wrong type of coolant can severely damage your engine. The manual will have the specific recommendations for your vehicle's cooling system, including the proper coolant type and the correct mixing ratio with water.