To buy the right oil you need to know SAE Viscosity Grade and API Quality Index oil for diesel or gasoline engine. You can select any Brand from the listed.
Example: for gasoline engines Cadillac Ct6 (2st generation) 2019, suitable multigrade synthetics oil 10W-50 quality SP, SN+, SN.
For bodies made in 2023, for the cold season, recommended only synthetics 0W-50 \ SP, SN+, SN.
If possible, check the selected oil for compliance with the manufacturers specifications and service intervals.