Thanks Alan. I use oil when polishing with 50 k diamond on my batt lap. I am aware of all of the functions of the oil that you describe (lubrication, award removal and cooling).
I guess u have been confused by the term diamond extender and its implications/significance when I see it referred to. So, thanks for clarifying
I do find it interesting and confusing that none of the references I see to “diamond “extender” actually identify the nature/identity/role if the extender fluid