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The type of oil recommended for the 2009 GMC Sierra is 5W-30. It is important to regularly change your oil, typically every 5,000 to 10,000 miles. Failing to change the oil can lead to engine problems. High-quality oil is essential for optimal engine performance. Issues with the oil may arise, such as a strong burning odor, which should be addressed promptly to prevent potential engine damage. Using subpar oil can result in engine malfunctions, poor fuel efficiency, and unusual knocking noises.
In a 2009 GMC Sierra 1500/2500HD/3500HD, the type of oil used varies based on the temperature in your area. If it's below -20 F, you should use 0W-30 oil, and if it's above -20 F, use 5W-30 oil, regardless of the engine option chosen.
Can you tell me what type of oil the brand is?