Karl,
Do these numbers that you're passing along come from the manufacturer, or from
someone who's taking
oil that they purchased and measuring it?
The most comprehensive discussion/resource I've found about this topic is from
Chuck Navarro of LN
Engineering, who's been tracking this for a couple of years and has contracted
with an independent
lab to do actual measurements. The real problem here is keeping up with how
quickly the
manufacturers change their formulations!
http://www.lnengineering.com/oil.html
Best,
chris
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