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According to GMC, the 2007 GMC Sierra 1500 HD with a 6.0L V8 engine needs 6 quarts of oil. They recommend using SAE 5w-30 full synthetic oil for best performance. To keep your engine running smoothly, it's advised to change the oil and filter every 5000 to 7500 miles. If the oil is not changed regularly, it will lose its thickness and may not adequately lubricate the engine's parts like the pistons and cylinders. The cost of oil varies depending on whether it is traditional or synthetic, and the price can range from $5 to $10 per quart. When adding new oil, be sure to also replace the oil filter.
The 2007 Sierra offers various engine choices, which means that the oil capacity differs based on the engine type. The 4.3-liter engine requires 4.5 quarts of oil, while the V8 engines need 6 quarts.