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The recommended oil for a 2002 GMC Sierra 1500 is 5w30 with a capacity of 4.5 quarts. You will need to change the oil periodically to avoid engine issues. It's best to change the oil every 5,000 to 10,000 miles. Using high-quality oil is crucial for the engine's performance. Neglecting oil changes can lead to engine problems, such as a burning smell. If you notice this smell, it should be addressed promptly to prevent any potential hazards. Old or low-quality oil can cause the engine to malfunction, indicated by a knocking noise and reduced gas mileage.
The 2002 GMC Sierra 1500's standard engine, the 4.3L V6, needs 4.5 quarts of 5W30 synthetic oil. If you opt for one of the additional engine choices - the 4.8L V8, the 5.3L V8 (not suitable for flex fuel), the 5.3L V8 (compatible with flex fuel), or the 6.0L V8 - all of them will require 6 quarts of 5W30 synthetic oil.