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Originally Posted by SubieRubyRoo
Originally Posted by Mad_Hatter
Isn't it as VI goes up the volatility goes down?
I don't think it's entirely scientific (VI vs. volatility), but I have generally seen the opposite. An oil like Eneos Sustina 0W20 with a VI of 227 had a Noack of around 13%, while the Amsoil SS 10W30 with a VI of 147 has a Noack of about 4.7%. Others generally seem to follow this trend, even in one manufacturer's line of oils such as Amsoil SS.
Yup, that's been my observation as well. Use of higher visc, higher quality base oils with less VII will result in a lower NOACK, whilst the use of a lighter, less expensive base with more VII will result in a higher volatility. See Ravenol SSL 0w-40 @ 8% (PAO) versus SOPUS SRT 0w-40 at >13%.
Originally Posted by Mad_Hatter
Isn't it as VI goes up the volatility goes down?
I don't think it's entirely scientific (VI vs. volatility), but I have generally seen the opposite. An oil like Eneos Sustina 0W20 with a VI of 227 had a Noack of around 13%, while the Amsoil SS 10W30 with a VI of 147 has a Noack of about 4.7%. Others generally seem to follow this trend, even in one manufacturer's line of oils such as Amsoil SS.
Yup, that's been my observation as well. Use of higher visc, higher quality base oils with less VII will result in a lower NOACK, whilst the use of a lighter, less expensive base with more VII will result in a higher volatility. See Ravenol SSL 0w-40 @ 8% (PAO) versus SOPUS SRT 0w-40 at >13%.