Greetings Len,
My SX3 is setup with the Syil CNC conversion kit and I am using ordinary 30WT oil.
On my CNC SX3, 68WT way oil provides too much stintion for the power of the stepper motors and the velocity of the axis travel resulting in missed steps.
Not seen in my photos, is that the additional ports on my homebrew lube manifold are also supplying the three ball screws, the Z axis ways, the quill and the spindle with oil.
http://www.home-machine-shop.com/ONE_SHOT_OILER/
Ned