kinematic viscosity
kinematic viscosity
(OP)
Can someone explain why 0 and 5 weight have the same kinematic viscosity rating? I read that in the Bosch Automotive Engineering handbook.
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RE: kinematic viscosity
Non Winter grades are characterized by their Kv100 and High Temperature High Shear rate viscosities and don't require low T testing. Multigrades require both.
I haven't ever heard of commercial W-grade monograde products, but for example if one had a lubricant with Kv100 of 3.9 then it could be a 0W or a 5W monograde depending on its low T performance. It would not be a 0W-20 or 5W-20 because those require both the applicable low T performance AND Kv100 of 5.6-9.3 cSt (along with HTHS at least 2.6 cP).
Understanding viscosity behaviors and specifications can be confusing, and that's a big reason why the SAE grading system has been so widely adopted.