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How many gallons of antifreeze goes inside a 2006 Chevy Impala?

According to the 2006 Chevy Impala Owner’s Manual, the proper coolant capacity for the Vehicle Cooling System is 1.20 gallons (4.57 liters) if the vehicle has a 3.5L or 3.9L engine, or 1.65 gallons (6.25 liters) if it has a 5.3L engine.