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The low temperature kinematic viscosity isn't necessarily identical. For example, Amsoil's Signature Series oils:
0W-20: 46.6 cSt@40C
0W-30: 58.2 cSt
0W-40: 85.7 cSt
Buuut...viscosity testing for the "W" designation happens at temperatures much lower than 40C, which aren't reported on any data sheets that I've seen.
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