I was trying to find a graph showing 0wX products but came across this graph of 5W30 and up motor oils at ambient temperatures. The graph starts at 0 C and goes up to 30 C. Unfortunately is does not cover 0 C down to -40 C for our friends in North Dakota and Canada.
You can see the lowering in kinematic viscosity (in cSt) as the winter ratings drop from 20w to 15W, to 10W, to 5W and you could probably extrapolate to 0W. Also, you don't have to wait until -40 C to see that the viscosity of a 5W30 is much less than a 15W40 even at say 0 degrees C. Keep in mind the units are in cSt, the same units as your viscosity at 100 C where the viscosity runs from 8 to 16 cST depending on which oil you use. It’s up to you to decide if the info is applicable to your operating conditions. Enjoy.
You can see the lowering in kinematic viscosity (in cSt) as the winter ratings drop from 20w to 15W, to 10W, to 5W and you could probably extrapolate to 0W. Also, you don't have to wait until -40 C to see that the viscosity of a 5W30 is much less than a 15W40 even at say 0 degrees C. Keep in mind the units are in cSt, the same units as your viscosity at 100 C where the viscosity runs from 8 to 16 cST depending on which oil you use. It’s up to you to decide if the info is applicable to your operating conditions. Enjoy.
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