I use Castrol 0w-40 mainly because of the fuel dilution and timing chain issues. Im not to worried about LSPI, I haven't found much for LSPI issues for the 3.5 Eco. I change at 5k intervals, but I have not done any UOA. I did consider using 5w-30 for the last OC I did just last week, but decided against it just because I have a jug of 0w-40 already for the 6th quart.
I do use the 0w-40 vs 5w-40 just because of what Ive read on here about it being a "better" oil. IDK....
I am the one who is pushing that and here is why, just to be clear.
Frst, both oils are same price. So that is comparison measure. Not that Edge 5W40 is bad oil, but for the same price you can get more.
Edge 0W40 has lower cst, between 12.9 and 13.1 depending on batch. However, HTHS is at 3.7 while Noack is at 9.1%
Edge 5W40 has cst at 13.9 but HTHS is same as 0W40 at 3.7. That means that Edge 0W40 has same HTHS but it has lower KV100 which indicates better base stock (and 0W40 is 25-50% PAO, while 5W40 is strictly GrIII). Also, Edge 5W40 has Noack 11%. If they were both same base stock, 5W40 should have lower Noack, but it dos not.
In the end for those who are not interested in such details, Edge 5W40 does not have MB229.5 approval, while Edge 0W40 and Mobil1 0W40 FS do have.