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kinematic viscosity

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.

RE: kinematic viscosity

Assuming you are referring to SAE Viscosity Grades for Engine Oils (SAE J300) there is no such thing as 0 or 5 grades.  What there is is 0W and 5W.  W grades are defined by their low temperature performance (as gauged in the Cold Crank Simulator and Mini Rotary Viscometer tests).  Both grades require a minimum Kinematic viscosity at 100 C of 3.8 cSt, but have different low temperature requirements.  

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.

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