The Cooler is a general purpose multi-duty synthetic chemical coolant for use on cast iron, ductile iron and most other metals. The Cooler leaves a completely water-resoluble rust-preventative film on machine and parts. No gummy, sticky, tacky residue to tie up machine, which creates excessive maintenance costs and also will contribute to excessive bacterial growth. Formulated with a unique blend of wetting agents, The Cooler rejects tramp oil emulsification providing for easy removal of this contaminant through skimming, centrifugation, or other appropriate means. The Cooler contains unique corrosion inhibitors providing corrosion and stain protection on cast iron, steel, aluminum, brass, copper and most modern alloys.