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Makes no difference. Lube is used to fill in rough rubbing surfaces so the peaks don't rub against each other and shear off material. This is the basis of lubrication.
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Well, it actually does.
CI is easier to lubricate effectively than steel.
The larger grain structure in CI provides a lot of places oil can sit and not be actually at the friction points.
This allows it to migrate after the a moving pass back out on the surface.