Is the shearing out of grade still true for the new SP formulation? If so, does that matter? IMO, HTHS is the important metric, not 40wt vs 30wt. And even so, Mobil 1 0w-40 FS passes all the stringent Euro standards, like stay in grade, chain wear, oil level drop over long intervals etc.
Yes. If you don’t like that behavior the ESP X4 0W-40 holds viscosity better it appears.