Closing the loop on this, the Service Manager confirmed only the following part numbers will be used for oil changes on the ATS:
1. ACDelco Bulk Dexos1 Gen2 Full Synthetic 5w30 - part #88865720
2. Mobil 1 Full Synthetic 5w30 - part #10953468
3. Oil filter - PF64
#2 would only be used in the unlikely event that #1 was unavailable.
1. ACDelco Bulk Dexos1 Gen2 Full Synthetic 5w30 - part #88865720
2. Mobil 1 Full Synthetic 5w30 - part #10953468
3. Oil filter - PF64
#2 would only be used in the unlikely event that #1 was unavailable.
