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- Feb 28, 2010
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I was curious about this when I read this off of the Discovery Channel site:
An oil's total base number tells us how the oil reacts to acid buildup in the engine. The better the oil withstands acid buildup, the higher the total base number.
The NOACK volatility number also reflects the oil's quality. A volatile compound is one that evaporates when heated. When oil is heated, the smaller molecules can evaporate while the larger molecules remain. This makes the oil sluggish and depletes oil volume over time. The more volatile an oil is, the higher its NOACK volatility number. Therefore, a low NOACK rating indicates high-quality oil.
My assumption is that the NOACK testing though is done at a temp of which most engines never really reach. So in Theory is NOACK a fair test to judge an oil's quality?
Sure an oil is a sum of its parts, but with more and more engines going to DI fuel delivery and forced induction people need to know what to really look for to make a solid oil choice for their car.
Jeff
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