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The recommended coolant for the 2009 Nissan Altima is Genuine Nissan Long Life Antifreeze/Coolant, which should be green in color. An alternative option for your vehicle is ZereX 1 Gallon Green 50/50 Coolant/Antifreeze. The purpose of coolant is to help regulate the temperature of your vehicle's components, including the water pump. It prevents overheating and engine freezing in cold weather. Since maintaining proper coolant levels is crucial for its function, make sure to check it regularly to avoid running low.
For the 2009 Nissan Altima, it is best to use the Prestone 1-gallon yellow 50/50 coolant and antifreeze mixture as the recommended coolant.