Local GMC dealer is installing and confirms that they are using basic (no brand) Full Synthetic 5W-30 DEXOS Gen2 oil. The oil cap simply says 5W-30 DEXOS. I would expect to find a requirement for a diesel oil meeting API CF.
These are the oils that I found that work. Each of the ones below are API CF compliant.
Pennzoil recommends: Pennzoil Platinum Euro L SAE 5W-30 Full Synthetic Motor Oil
Mobil recommends: Mobil 1™ ESP 5W-30
Valvoline says: No oils that meet DEXOS2.... They do have FullSyn 5W30 DEXOS2, but it is not API CF compliant, thus the answer No Oils.
Castrol recommends: Castrol EDGE 5W-30 C3
Since there is no API CF requirement from GMC, it makes me wonder if the house brand oil that they are using is correct for this engine. Thoughts?
These are the oils that I found that work. Each of the ones below are API CF compliant.
Pennzoil recommends: Pennzoil Platinum Euro L SAE 5W-30 Full Synthetic Motor Oil
Mobil recommends: Mobil 1™ ESP 5W-30
Valvoline says: No oils that meet DEXOS2.... They do have FullSyn 5W30 DEXOS2, but it is not API CF compliant, thus the answer No Oils.
Castrol recommends: Castrol EDGE 5W-30 C3
Since there is no API CF requirement from GMC, it makes me wonder if the house brand oil that they are using is correct for this engine. Thoughts?