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OK, since nobody wanted, or could, give credible information on this I will give you the reason I am certain I am correct. This can be done by anyone for free saving the 125 dollar fee for services yet to be rendered with no guarantee of quality.
First, take a gander at the technical data sheets of motor oils branded "synthetic" made by Castrol (Syntec), Chevron and Shell. Then compare those figures to the motor oils branded "synthetic" made by Mobil (Mobil 1), AMSOIL (the 20 plus motor oils that do not have the "XL" badge) and Redline. Now in order to be fair and compare "apples to apples" you need to pick a viscosity and stay with it. For example if you are comparing 5W-30 you need to make sure every oil is 5W-30 in every brand.
Make a note, while this isn't easy, many companies put their technical data in different places on their websites, others make them "available on demand" and you'll have to ask for the information. But being resourceful you will come to the same conclusion as I did:
Group III motor oils are not as thermally stable - volatility (NOACK % loss) favors the Group IV.
Pour points are not at as cold a temperature for the Group III oils compared to the Group IV oil despite the fact that the Group IV oil have little or no VI additives.
Viscosity index always favors the Group IV.
Fire point always favors the Group IV.
4 Ball wear test tends to favor the Group IV.
Shear stability favors the Group IV.
If I were comparing Group III to Group II, the differences would have been obvious. Group III are a lot better. But not up to the Group IV oils.
Also, the statement saying that PAO base stocks are made from varying viscosities flies in the face of fact. Where did that information come from? I don't doubt this is done, but by whom and where? I know for a fact the PAO base oils are made to a viscosity. Why o why would anyone feel it necessary to mix several to get a "average?"
Once again, did I get it wrong? Show me, I'd like to think I have an open mind.