Choosing the proper grade of oil is a critical step in engine maintenance. Your Cadillac Certified Service experts offer a range of oil types, including ACDelco dexos1TM Full Synthetic and Mobil1TM Full Synthetic. Ask the experts which grade of oil you should use for your specific Cadillac model. You can also check your Owner's Manual for the correct grade (dexos1 oil is used with Premium Care Maintenance).