STP® Heavy Duty 50/50 Premix Antifreeze/Coolant

STP® Heavy Duty 50/50 Premix Antifreeze/Coolant is a superior fully formulated traditional engine coolant that is recommended for use where a heavy duty diesel coolant is required. This includes, but is not limited to, Caterpillar, Cummins, Detroit Diesel, Ford, GM and Volvo Mack. It is phosphate and amine free and does not require an initial charge of supplemental coolant additives (SCA) upon initial fill.

It meets the performance requirements of the coolant specifications:

  • ASTM D-3306
  • D4985
  • D6210
  • Detroit Diesel 7SE298
  • 93K217
  • GM 1825M
  • 1899
  • TMC RP 329B

It provides protection against radiator freeze-up down to -37°C and boil over to 129°C (with a 100 kilopascal {15 psi} radiator cap in good condition). The low silicate level of this product allows it to be used in multi-vehicle fleets including automotive, light duty and heavy duty diesel applications, such as on-road truck, off-road and farm applications.