I'm curious as to how the SAE came up with their grade divisions. Why aren't they nice even ranges?
20 weight covers a range of 3.7cSt.
30 weight 3.2cSt
40 weight 3.8cSt
50 weight 5.6cSt
60 weight 4.2cSt
Anybody know how they come up with this?
20 weight covers a range of 3.7cSt.
30 weight 3.2cSt
40 weight 3.8cSt
50 weight 5.6cSt
60 weight 4.2cSt
Anybody know how they come up with this?