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 Catera (1st generation) 1994, suitable multigrade mineral oil 10W-30 quality SM, SL.
For bodies made in 2002, for the cold season, well suited semisynthetics 5W-30 \ SM, SL.
If possible, check the selected oil for compliance with the manufacturers specifications and service intervals.
Checking the Engine Oil condition