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Thanks Farmer. And I wonder if the actual operating temp viscosity of the 0w20 isn't lower in the 20 range than the 5w20 at operating temp?

I always use full synthetic in everything, even my push mower. I know this is over simplifying but, can I switch to 0w20 as an upgrade from 5w20? What is the downside? (Also from 5w30 to 0w30?)