Circa 2004 specs:
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Some Mobil 1 contains some Group III.
Some contains none.
For example, Mobil 1 V-Twin 20W-50 is a blend of two PAOS with additives and something to control seal swell.
It is the most stable and shear resistant of all the Mobil 1/Delvac 1 formulas.What has happened is that a PAO (polyalphaolefin) shortage has developed. Some new plants, like ExxonMobil's Beaumont plant, did not get to full capacity right away.
Also new requirements in automatic transmission fluids have required the use of PAOs in place of other stocks.
Some of the smaller chemical companies have begun to produce PAOs.
Large companies like Chevron, BP, and ExxonMobil adjust their formulas to reflect the supply, the price, and the requirements of the ingredients.
The current crop of Group III can replace some or all of the PAO in many applications with zero degradation of performance.
You'll be seeing new Super Group III and Super PAO in products over the next few years.
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If I have to double my sump capacity to double my drain interval, how do I save any money?
I believe current SM oils would be more than capable of handling 10,000 to 15,000 mile OCI in virtually all domestic cars if the sump capacity were increased from the current 4-5 quarts to 9-10 quarts.
Virtually all European cars that spec long drains have sump capacity that is 50% to 100% larger than the typical American car.
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I'd say it's looking more and more like they started using Group III when the EP line was introduced.
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Look whether you like Mickey or not...
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...I think his last post above indicates what is going on. I think he finally was able to get information from his sources bc he now confirms the existence of Group III in some M1 viscosities...