here is some basic translation to give an idea what author trying to explore:
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Deciding to run "Noack test" (The NOACK Volatility Test, otherwise known as ASTM D-5800) using wider temperature diapason and a time durations, lead to results is drastically different results, despite like the same oil.
At the initial state during the heat the oil became darken with varying degrees of intensity.
BUT, reaching a temperature of 250-270 degree Celsius, one of the very common oils on the market, produce a noticeable bottom sediment within minutes ...
So this first result became a borderline: Sedimentation (or polymerization) appears in a minute or less; when the oil reach a critical temperature.
When the liquid fraction was tested in the lab the result for about ten different tests, polymerized and the clean ones was the same:
Viscosity for 100 Сelsius for ALL test without exception (good and bad) give between 4-6 cCt, equally to base-stock oil. Same test for SAE50, 20W50, 10W60 give a result around 7-12 cCt
An initial assumption was: viscosity modificator fail under high temperature: Same test of manufactured "stop smoke"; "oil stabilizator" e.t.c. ;as all of them in fact viscosity modificators; do not produce the same repeatable result with sediment as was initially discovered with bad oil.
Finally analyzes was done on 3 different oil type that pass high temperature test:
produce a clean result:
http://ic.pics.livejournal.com/bmwservice/44166753/23484/23484_600.jpg
moderately dirty:
http://ic.pics.livejournal.com/bmwservice/44166753/23679/23679_600.png
completely dirty:
http://ic.pics.livejournal.com/bmwservice/44166753/23808/23808_600.png
Then result was tested in the lab:
ALL oils with clean result keep additives as it was in the initial oil.
moderately or dirty oil drop more then half all additives in sedimentation.
Conclusion:
The main problem of modern synthetic motor oils - is low chemical stability in the final product.
This behavior perfectly and simply visible even in the Lab without any mechanical or Chemical forces, or any kind of load that do not "perfecting" the oil stability.
These processes of polymerization take place outside of the full amount of oil (oil pan), it happens locally in a very thin layer at the high temperature areas, with poor oil circulation and high pressures, and therefore practically not visible to any modern techniques.
Author's major idea is: such the oil behavior produce the oil ring sticky, move-less, non working; that finally lead to significant oil consumption and the engine degradation.
The author working in auto service industry, specifically BMW engine diagnostics; by bore-scope etc....
And his years and years of observation of faulty engines lead to such a simple correlation:
Look at Hot temperature European engine; not a perfect design of oil rings; heavy traffic stop-and-go with minimal air circulation and top temperature under hood
adding the oil that able to do polymerization in the most sensitive parts of engine, (piston rings) lead to significant problems under 100K KM (60K Mile)
His universal recommendation is 0W40 Mobile1 - as wide available, stable oil
