When should I replace my coolant fluid?
In general, follow your OEM’s (Original Equipment Manufacturer) guidelines. If you do not have a guide and are using traditional coolant, then change every two years. Extended Life Antifreeze/Coolant is every 5 years or 250,000 km. Extended Life Heavy Duty is 960,000 km, 12,000 hours, or 4 years, whichever comes first.
It is important to note that you should check a coolant system at least twice a year. If the coolant is dirty, cloudy, or full of particulate, then the coolant system should be drained, flushed, cleaned, and refilled with a pre-diluted good quality coolant. Also, the reason for the bad condition of the coolant should be determined.