QUOTE(Matrix @ Aug 13 2014, 10:04 AM)
The x30/40 does not refer to temperature lah....aduh...

his standpoint is viscosity thickness/weight is affected by temperature
eg: oil will be more fluid on hot, and more viscous on cold (can refer to the oil film on the surface of your curry dish, taken out from fridge,and after heating it up)
now, what he doesn't know, is that modern EO have strong additives that expands the Viscosity index.
what that does is that as the VI goes higher, the viscosity change in regards to temperature is reduced.
example: oil is still fluid even in subzero temperatures (so that oil travels through pumps/channels fast enough during cold start), and still thick enough during extreme heat to prevent shearing/flashing and result in lack of lubrication.