STP® High Mileage Radiator Treatment & Stop Leak

STP Oil Treatment bottle


  • Seal leaks in radiator, freeze plug and gaskets
  • Conditions cooling system and protects against coolant loss
  • Anticorrosion ingredients help protect against future leaks
  • Works in plastic, metal and aluminium radiators

Take Note!

STP® Radiator Treatment & Stop Leak is compatible with all anti-freeze types.