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The 2011 Buick Regal has a 6.3-quart capacity for the six-speed automatic transmission. Buick suggests using Dexron VI automatic transmission fluid for optimal engine protection. I recommend checking the transmission fluid each time you change your oil to ensure it's at the correct level and clean. If you notice a sparkly or reflective appearance or experience gear issues, that may indicate debris. It's also wise to replace the transmission fluid every 35,000 miles to maintain smooth operation, as the fluid wears out over time.
The amount of transmission fluid that the 2011 Buick Regal can hold is 5 quarts in the US measurement system.