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All this smells a lot like silly California smog-regulations. To have the CARB-EO number stamped on your catalytic for legal sale in CA, you need to have it submitted to, tested and approved by CARB. However, just because there's a list of 100-approved products for the CA market, doesn't mean that there's an additional 5000 catalytics that will work just as well. In fact, most of those 100 approved products are the exact same sold in the other 49-states. Just that the ones in Cali has been "approved" by the CARB. The other 5000 will work just as well, they just don't have the stamp.
Same thing with oils, sure Porsche tested X-number of oils and put them in their specs chart. That doesn't mean there's not a tonne of other oils developed after 1987 that meets or exceeds Porsche's requirements.
To really make this discussion worthwhile, please provide a list of objective, measurable criteria that Porsche used to test their oils. Only by replicating Porsche's own tests on newer oils can we know for sure if they do or do not meet those specifications.
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