A phosphate inhibitor such as Dipotassium Phosphate (DKP) is included in many antifreeze formulas to provide several important functions that help reduce automotive cooling system damage. The benefits provided by the phosphate include:

  • Protect aluminum engine components by reducing cavitation corrosion during high-speed driving.
  • Provide for corrosion protection to ferrous metals.
  • Act as a buffer to keep the antifreeze mixture alkaline

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