Owner's Manual
Page 376
... only an oil that do not have the GM4718M Standard designation can add substitute oil designated SAE 5W-30 with the starburst symbol at the factory with a Mobil 1® synthetic oil meeting GM Standard GM4718M should have the starburst symbol on an oil container show its viscosity, or thickness. Oils meeting... oil level, oil meeting this standard may be identified as SAE 20W-50. This symbol indicates that the oil has been certified by the vehicle warranty. . Substitute Engine Oil: When adding oil to Use Look for an oil change. .
... only an oil that do not have the GM4718M Standard designation can add substitute oil designated SAE 5W-30 with the starburst symbol at the factory with a Mobil 1® synthetic oil meeting GM Standard GM4718M should have the starburst symbol on an oil container show its viscosity, or thickness. Oils meeting... oil level, oil meeting this standard may be identified as SAE 20W-50. This symbol indicates that the oil has been certified by the vehicle warranty. . Substitute Engine Oil: When adding oil to Use Look for an oil change. .