The amount of motor oil that a 97 GMC Yukon can hold is estimated to be 6 quarts. The oil recommended for this car is Mobil 1 5W-30. It is described as a full synthetic motor oil that keeps the engine running. It offers protection and offers the overall performance. Find out more from http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_5W-30.aspx.