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Expired coolant: risks and replacement frequency

M
Max
4 minMay 22, 2026
Expired coolant: risks and replacement frequency

Real coolant lifespans

  • IAT (green, old): 2 years / 40,000 km
  • OAT (orange/pink, modern): 5 years / 80,000 km
  • HOAT (hybrid): 3-4 years / 60,000 km

Never mix types — gelatinous precipitate clogs everything.

Warning signs

Brown/rusty color, pH below 7 on test strip, glycol density below -25°C protection.

Ask the AI mechanic — share your model, the AI returns capacity, fluid type, and OEM interval.