Mobil 1 0W-40, 8.4k mi OCI, 144k mi, 2013 Cadillac CTS-V

[The Critic]

Looks like your Calcium levels match the ones in my UOA - my oil was also installed in 2022:
https://bobistheoilguy.com/forums/posts/6531654/

I guess M1 0W40 may have used a different add pack for a short-time in 2022?

 

[Emperors6]

Looks like your Calcium levels match the ones in my UOA - my oil was also installed in 2022:
https://bobistheoilguy.com/forums/posts/6531654/

I guess M1 0W40 may have used a different add pack for a short-time in 2022?

Yeah, I think the high Ca levels are typical for that time range. It doesn't matter for me since this car is not direct injected. My Ca levels are lower for my other UOAs with M1 0W-40 since I usually dilute it with some leftover M1 15W-50. For this UOA it was only M1 0W-40.