Quote:
Originally Posted by LSA
According to the EE video, cold flow is measured at NEGATIVE 10C and NEGATIVE 40C. Also, the video implies that cold flow does not refer to less the than operating temp but rather what could best be described as winter ambient temps. (Yes, technically winter ambient is less than operating, but you get the point)
Is the video incorrect?
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It's remarkably hard to find a solid answer on what temps are used for the cold-temp nominal viscosity rating. The most common answer seems to be that the low number is rated at 0F, or -17.8C. There is a also a pour point often published for an oil that tells us what temp it stops flowing altogether.
What's important, and what I was pointing out, is that the published viscosities for most oils are at 40C and 100C, and that even a 0w-XX oil has much more resistance to flow at 40C than a "thick" oil (like straight 50w) at 100C. IOW, all the talk about a 0w-XX oil only having benefits in very cold climates is just wrong, because it has much better flow during a "cold start" at 104F too.