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Go back and read that infamous thread. One or possibly two of the Extended Protection oils MIGHT be mostly Group III. Any conjecture about any other Mobil 1 product would be based on absolutely no data.
I think YOU need to reread the thread. It was THREE grades and the samples were taken over a two year period. The samples were analyzed by a professional with over 20 years in the industry and was peer reviewed. Think of the odds of it being a random occurrence or a mistake.
And why would EOM use less expensive Group III basestocks in it's "Premium" grade charging a premium price but not the "Standard" grade that's priced lower?
Finally, a retired EOM employee admitted on another forum that EOM does use Group III in it's M1 product line.