Originally Posted By: Smoqueed
the 0w40 castrol is a little thicker than the M1 0w40 iirc. Usually the M1 shears to a thick 30 pretty quickly because it's so borderline. Being turbo charged, I would prefer the slightly thicker oil, but honestly it probably makes zero real difference. Either are fantastic oils
Where have you seen this? What I've seen posted lately is that it's been very shear stable.
At least when you can differentiate between fuel dilution and actual mechanical shear, which I'm not convinced you can with nearly all the UOA posted here.