5w-30 shear toward 5w-20s

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Did a little reading at work today about some 5w-30s shear down close to 5w-20. So if a car specs 5w-20 recommended, but 5w-30 can be used (higher temps etc), why not just go and stick with 5w-30 if it shears toward 5w-20 since 5w-20 is the most recommended if it specs for it.

Thinking in terms of GDI & dilution - specs 5w-20 and dilution compared to 5w-30 and dilution.
 
I wonder if we know what oil-engine combinations, that holds true for? Would not the company engineers know that when making their oil change recommendations? One thing I do know from my owners manual is that 0w20 in a recommendation in USA & Canada only and 5w30 elsewhere. Ed
 
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