2007 GMC Acadia: What is the oil type and capacity?

The 2007 GMC Acadia has a 3.6 L V6 engine that needs SAE 5W-30 Synthetic Motor Oil in all temperatures. The capacity for the vehicle iS5.5 quarts with a filter and the torque for the drain plug is 18 ft/lbs. 5W-30 means that 5 is the thickness or the viscosity of the oil at startup, w is for winter and 30 is the thickness or the viscosity of the oil at operating speeds. Oil is used to help keep the engine clean and parts of the engine lubricated to help with friction. You need to change the oil and filter every 7,500 miles or 12 months, whichever comes first. The cost of an oil change if taken to a mechanic is anywhere from $40 to $50 in labor costs.