Well, regardless of how accurate the V vs T plots are below -10C or -15C, it still gives someone a visual of how different viscosity ratings behave with temperature in a general sense. Most people have no idea how the viscosity changes (very non-linearly) with temperature, especially down below 0C.
What would be interesting (I haven't seen it anywhere) is a correlation between the different "W" ratings and the corresponding viscosity for each "W" rating range (in cSt, not cP). Like said earlier, they wouldn't be rated at 0W, 5W, 10W and 20W if they didn't fall into the proper defined "W" viscosity range, and therefore highly doubt that any lower "W" rated oil's viscosity is going to cross over another higher "W" rated oil and be more viscous anywhere below 0C, regardless of how accurate the V vs T curve plotting tool is. If someone can find one, I'd like to see it.
What would be interesting (I haven't seen it anywhere) is a correlation between the different "W" ratings and the corresponding viscosity for each "W" rating range (in cSt, not cP). Like said earlier, they wouldn't be rated at 0W, 5W, 10W and 20W if they didn't fall into the proper defined "W" viscosity range, and therefore highly doubt that any lower "W" rated oil's viscosity is going to cross over another higher "W" rated oil and be more viscous anywhere below 0C, regardless of how accurate the V vs T curve plotting tool is. If someone can find one, I'd like to see it.
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