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The recommended oil type for the 2009 Nissan Altima 2.5 engine is 0W-20. Regular oil changes are essential to maintain a healthy engine, typically every 5,000 to 10,000 miles. Failing to change the oil can lead to engine problems, so it's crucial to use high-quality oil for optimal performance. Neglecting oil maintenance can result in issues such as a foul burning odor, which should be promptly addressed to prevent any potential hazards. Using poor-quality oil may cause the engine to malfunction, resulting in decreased fuel efficiency and potential knocking noises.
For the 2009 Nissan Altima equipped with a 2.5L engine, it is recommended to opt for a 5w-30 synthetic oil.