The pendulum is starting to swing back from these low viscosity oils, I think. Maybe CAFE softening up a bit or the amount of warranty claims is becoming unsustainable. Early 5.0 Fords called for 5w20. They quietly bumped it to 5w30 for 2021. And if you add the factory supported Whipple supercharger? The spec becomes 5w50.
Waiting to see if GM will follow suit. Even their non-defective “healthy” 6.2s have no business running 0w20. Not at the oil temperatures I saw on my stock 2019 and not at these OCIs either. In fact, studies have shown increased piston ring and bearing wear when the HTHS viscosity is at or below a typical hot SAE20. And the handful of 0w20s that actually are stout enough in HTHS are niche, expensive and carry no approvals. So for practical purposes they don’t exist.