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First of all please don't confuse an oil's cold (i.e. W, Winter) temperature viscosity with the ability to protect bearing surfaces. Amsoil Series 2000 0W-30 gets the 0W SAE rating simply because it does not thicken up at even the most extreme cold temperatures unlike petroleum oils.
This has nothing to do with "thin" or "slip past" or oil burning....pretty much all these things are past, interesting, colloquial ways of thinking about engine oils - again mostly urban lore - and things like "my car burns less oil when I fill it with SAE 60 oil".....
In a nutshell motor oils do many things, the thing you seem interested in is wear protection. Oil does this by rapidly flowing on, around and between moving parts - what most folks don't know is that actually metal to metal contact is very nasty - oils have antiwear additives to simply minimize the ugly effects of this contact - which have NOTHING to do with oil viscosity. And in fact an oil that someone may think is "thin" because of it's low W SAE rating may actually do a better job of protecting. This protection needs to be done without the carrier oil (or thickener additive, etc) degrading also.
Amsoil Series 2000 0W-30 is rated for 35,000 mile change intervals in non-turbos, and does not need further additives.
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http://www.fidalgo.net/~brook4/oilslubesfilters.html
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