Mobil 1 0W-40, 8k mi OCI, 126k mi, Cadillac CTS-V

[Emperors6]

All mileage is in kilometers not miles. Notes from oil slip: "mostly regular driving in all seasons including harsh winter in northeast US and Canada plus some winter autocross driving events." Last fill is 5 qts of Mobil 1 0W-40 and 1 qt of Mobil 1 15W-50. Next fill is 5 qts of Mobil 1 5W-30 and 1 qt of Mobil 1 15W-50.

Since the last UOA I replaced my primary cats and the CEL (check engine light) is now gone and all is back to normal.

 

[himemsys]

Last fill is 5 qts of Mobil 1 0W-40 and 1 qt of Mobil 1 15W-50. Next fill is 5 qts of Mobil 1 5W-30 and 1 qt of Mobil 1 15W-50.

Of the six reports in the image above, which one is "last fill" and which one is "next fill"?

 

[Emperors6]

Sorry for the confusion. Last fill is the fill for this UOA sampled on 12/10/2021 (in this thread) and next fill is what I put in for the next UOA.