Coolant prevents your engine from overheating and from freezing. It also protects against corrosion inside the cooling system.
In this article
- Why it needs changing
- Intervals
- Safety
Why it needs changing
Additives that fight corrosion wear out over time. Old coolant becomes acidic and can damage the radiator and water pump.
| Coolant type | Typical interval | Color |
|---|---|---|
| Conventional (IAT) | 2 years / 30,000 mi | Green |
| Long-life (OAT) | 5 years / 100,000 mi | Orange or red |
| Hybrid (HOAT) | 5 years / 150,000 mi | Yellow or other |
| Check the manual | Varies | Do not mix |
Intervals and costs are typical ranges. Your owner’s manual comes first.
Intervals
Many modern coolants last five years or 100,000 miles. Older types may need changing every two years.
Overheating is the one engine problem that can end a car.
Safety
Never open the radiator cap on a hot engine. Coolant is toxic to pets, so clean up spills.
Do it in this order
- Check the level monthly
- Use the type in the manual
- Flush on schedule
- Look for leaks
Practical tip
Do not mix coolant types. If you do not know what is in the system, have it flushed.
Bottom line
Follow the interval in the manual and use the specified coolant.
Specifications, prices and rules change. Confirm current details with the manufacturer or the relevant authority before you buy or repair.
