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The 2004 GMC Sierra 1500 comes with different engine options, but all except the 4.3L V6 use 6 quarts of oil, while the V6 uses 4.5 quarts. It is recommended to use 5w30 synthetic oil and change it every 7,500 miles or 1 year, whichever happens first. Regular oil changes can help extend your engine's lifespan, improve gas mileage, and enhance performance by removing particles and sludge. Neglecting oil changes can lead to engine issues over time as the oil becomes thinner and more damaging to essential engine components. Synthetic oil offers better performance due to reduced friction levels, providing added protection to the engine.
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The 2004 GMC Sierra 1500 offers several engine choices. It has the 4.3L V6 base engine requiring 4.5 quarts of oil, the 4.8L V8 needing 6 quarts, both the non-flex and Flex versions of the 5.3L V8 using 6 quarts, and the two variations of the 6.0L V8 (engine codes [N] LQ9 and [U] U) which all use 6 quarts of 5W30 synthetic oil.