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Re: 2004 Envoy XL Oil change
GM put a small access door right below the drain plug. There's a single screw you turn to open the door. In my experience, it has been a better all-around job to just take the time to remove the 4 bolts holding that whole plastic cover on there. You can get to the drain plug and filter easier, and there's not as much mess. As for the oil fill, i would start with 6 quarts.
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