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In America, the recommended oil for the 2003 Chevy Silverado 2500hd is 5w-30. It's crucial to use high-quality oil to ensure the engine functions smoothly. Problems with the oil can arise over time, indicated by a knocking noise from the engine or a burning smell. Using bad oil can even lead to the engine failing to work, or in extreme cases, causing the car to explode. It's important to address these issues promptly. Regular oil changes, about every 5,000 to 10,000 miles, are essential to prevent engine problems. Failure to replace the oil can result in decreased gas mileage and other engine issues.
The 2003 Chevy Silverado 2500HD should use 5w-30 full synthetic oil as per the manufacturer's recommendation.