This is still an opinion..Otherwise Manufacturers woulnt use or reccomend anything but 5w-30 or 30 weight.5W-30 oil has a higher viscosity than 20 therefore protects engine components more than a thinner oil like 20.
I guess you must know more than the guys who build this stuff?
Or, on the other hand, this same thicker oil could take longer to Circulate on start-up and cause metal to metal wear causing premature engine failure.
This is stated as an opinion...But it makes as much sense as your statement.
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