30w to 40w #

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What is the change point on the viscosity scale at cst 100*C where a high 30w becomes a low 40w? Example #s: 12.7 = 30w. 12.8 = 40w Hope I got all the vocabulary right! [Big Grin]
 
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A 30 wt has a min cSt of 9.3 and a max of <12.5 at 100*C. A 40 wt has a min of 12.5 and a max of <16.3.
 
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