SA of the AFE oils is .8. That's lower than most other full synthetics on the market. From the MSDS of Japan, they are about 30-50% PAO. The Ca/Mg combo is very similar to Castrol and I think it's an Infineum additive package.
I don't know how this generation of M1 compares to the prior in terms of extended drain capability. Years ago Mobil 1 had a Tbn of 11-12. It slowly dropped as they reduced the Ca levels and started using newer additives. It's now around 8-9 across the board. I think 15k miles is pushing it with this type of chemistry IMO.
Mobil does test test the [censored] out of their oils though. In that Motor Trend article they said they blend up to 500 blends a month.
I don't know how this generation of M1 compares to the prior in terms of extended drain capability. Years ago Mobil 1 had a Tbn of 11-12. It slowly dropped as they reduced the Ca levels and started using newer additives. It's now around 8-9 across the board. I think 15k miles is pushing it with this type of chemistry IMO.
Mobil does test test the [censored] out of their oils though. In that Motor Trend article they said they blend up to 500 blends a month.