STP® Extended Life 50/50 Premix Antifreeze/Coolant

STP® Extended Life 50/50 Premix Antifreeze/Coolant is a long service life product based on a proprietary organic acid technology (OAT). It is free of silicates, phosphates, borates, nitrates, nitrites and amines.

It meets the performance requirements of the coolant specifications:

  • ASTM D-3306
  • GM 6277
  • Japanese Standard JIS K2234
  • VW TL 774D
  • Ford WSS-M97B44-D

It provides excellent high temperature aluminum protection against temperature extremes, preventing freeze-up down to -37°C and boil over to 129°C (with a 100 kilopascal {15 psi} radiator cap in good condition).

It is fully compatible with other similarly formulated OAT coolants and is recommended for use in newer model foreign and domestic cars and light duty trucks. When properly diluted and added as an initial fill, it provides up to 250,000 km or 5 years service life protection.