Can the CT6 use 5W20 engine oil?

[OParker]

The CT6 cannot use 5W20 engine oil as this viscosity is too low for its engine. Using such oil would accelerate engine wear. The CT6 requires General Motors dexos1 specification oil with viscosity grades of 0W20 or 5W30. Approved engine oils meeting these specifications and certified by SAIC-GM carry the dexos1 certification mark. The CT6 is a mid-to-large sedan from the Cadillac brand. Taking the 2021 Cadillac CT6 28T Fashion model as an example, its dimensions are 5223mm in length, 1879mm in width, and 1492mm in height, with a wheelbase of 3109mm. It features a 4-door, 5-seat sedan body structure.