JHZR2
Staff member
Hi,
For this example take m1 5w-30 and 10w-30 oils. At 100C, their viscosity is almost identical.
So the 5w- oil meets a CCS spec at one temp and the 10w- oil meets a CCS spec at 5C warmer temp.
Around what temperature can we assume the viscosity numbers to begin matching up equally? Is the slope or the behavior of the viscosity line at all temps from the CCS line always different until we hit the 100C mark, or are they mostly identical, except at the low temperature mark?
Thanks,
JMH