This highly depends on the kind of material your tap and die tools are made of. Carbon steel tools use petroleum or synthetic based cutting oils, while alloy steel tools use petroleum-based cutting oils mixed with small amounts of mineral spirits or kerosene. This mixture also works well with stainless steel. On the other hand, caster iron tools use no lubricant, aluminum tools use kerosene or petroleum-based oils, brass tolls use mineral spirits or kerosene, and lastly, bronze tools use kerosene or mineral spirits mixed with small amounts of petroleum-based cutting oils.