silver billet
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I'm with you, however I have lifetime power train warranty and using a heavier viscosity oil might give them reason to deny claim.
It wont. Why? Because oil viscosity changes with temperature. If your engine can run 5w-20 at 0C and not cause issues, then it can certainly run 5w-30 or even 5w-40 at 100C because that thicker oil will actually be much thinner at 100C vs a 20 grade at 0.
Besides, you're less likely to need the warranty running a proper oil anyway. Premium synthetic at 5w-30 is the best thing for these hemis especially in the summer. In the winter running a 0w-30 might be better for more northern folk but even then, there is only a 5C degree difference in cold start between those grades.