Mid SAPS oil in a non SAPS engine?

Less saps, maybe a lesser protection on long oci.
In 90"s everything was much higher saps, cats and sensors lived happily.
So what is this all about?
You say that, but the dreaded P0420 code is far less common now than it was 20+ years ago. O2 sensors failed more frequently in the past as well, with some manufactures even having replacement reminder lights in the 80s.
 
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