Where has all the 5 qt Mobil 1 0W - 16 gone?

This is an old thread, but does anyone know why Toyota reduces OCI to 5K miles from 10K miles if 0w-20 is used instead of recommended 0w-16? Is it just CAFE compliance, or there is something special in GF-6b that allows oil to be run for a longer interval?
 
This is an old thread, but does anyone know why Toyota reduces OCI to 5K miles from 10K miles if 0w-20 is used instead of recommended 0w-16? Is it just CAFE compliance, or there is something special in GF-6b that allows oil to be run for a longer interval?
The manual says this?

I wouldn’t run a 0W-20 10,000 miles, much less a 0W-16.
 
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