:thumbsup: that is all, let these other guru's change your mind.
myself I run VR1 20/50 during the summer months in N Idaho .
I believe Chrysler recommended 20/50 for hot summer temps back in the day.
Me too, because I run a 195 stay and can see 200 with extended idling.
If running stock like temps, nothing wrong with 20w50 when it's warm. The proper grade becomes more important with low temp thermostats though (assuming the engine stays at the stat temp).
Someone recently posted a paper on oil viscosity, temperature, and how they interplay. The big take away was that thicker grades MUST be warmed up before they begin to offer their best shear and high pressure protection. That lighter grades warm faster and begin offering metal to metal protection much quicker. It's basically why new cars can be cold started and hammered on right away with no notable increase in wear.. And how they stay running even when they shut off and restart at every damn light (such a dumb feature..).