The 2004 GMC Envoy came standard with a 4.2-liter six-cylinder engine for both SEL and SLT trim levels. The motor oil capacity is seven quarts with the filter—to keep your SUV running smoothly you’ll need to change the oil out every 7,500 miles or about every 12 months. But it’s always a good idea to check your GMC Owner’s Manual to make sure you know your 2004 Envoy’s engine size.
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