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Re: different scales cold vs hot, or something...
Posted by LesH [Email] (more from LesH) on Mon, 22 Nov 2010 19:56:40
In Reply to: different scales cold vs hot, or something..., zef95, Mon, 22 Nov 2010 17:31:11
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Yep, the 0 and 40 are measured on different scales. Oil is always thinner when hot. Look at the viscosity in centistokes for a typical 0W-40:
http://www.esso.ca/Canada-English/Files/Products_Lubes/IOCAENCVLESEsso_Xd-3_extra.pdf
Viscosity at 40degrees C: 87 cSt
Viscosity at 100degreesC: 15.2 cSt
So it's 1/5 as thick at 100C as it is at 40C.
Also if you look at all the different xW-40 oils in that chart, you can see that some people thinking a 0W- oil is too 'thin' is erroneous - in fact 0W-40 is THICKER at operating temperature than straight 40!
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