@Fowvay:
Thanks for taking the time to further my education. I truely am grateful for your time and energy into explaining these things to me.
You realise your explanations are at odds with the original "Oil explained" treatis? (the link, above).
That author is clear in his explanation of synthetic oil, in that it's base oil is high viscosity and that it's room temperature viscosity is low (lower than the same grade multi-grade mineral oil). But, he does not speak to how it's manufactured to obtain those desireable properties.
On the other hand, you speak to it specifically, with details. The details just dont happen to agree with the original author. But hey, I'm OK with that. Data is good, so long as the data is good :)
One thing bothers me about your explanation of this point, tho. You write about the addition of viscosity modifiers to synthetic oils. I have in view here full synthetics, not blends. You also write about the ability to resist viscosity change, and denote it as viscosity volatility, a valuable property of the added modifiers. It's the addition of these modifiers that bothers me about the explanation. The original author is emphatic about the point that full synthetics have no additional viscosity modifiers to wear out over use. Yet, your explanation indicates there are these same modifier additives. (At least, I think I read they're the same idea). I am not educated enough on this subject to rationalize the opposing views, but I do note the opposing views...
On a different point...
The viscosity volatility property, with a lower numeric percentage value being better.
On this point, your goals and desires are different than the original author's. He stresses that his goal is to minimize engine damage during the (what he calls) critical startup time period, at room temperature. Your goal is apparently to reduce viscosity volatility so "...to meet the more stringent requirements of many European vehicle manufacturers and the newer emission requirements of the API and JASO standards".
All well and good. But, the goals *are* different. In my opinion, I like to minimize engine damage during startup, if it makes my engine wear (last) longer. But, that's just my opinion...
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