The appropriate time to change the engine coolan depends on the type of vehicle, the nature of its operation, and maintenance instructions.

For some vehicles, it is advisable to change the coolant after every 48,000 km in the car, according to a report published by Cars.com.

But this is not a rule, for example, Hyundai says the coolant in the engine on most models should be replaced after the first 96,000 km, then every 48,000 km after that.

The interval is every 48,000 km in some Mercedes-Benz models with some engines, in others it is 193,000 km or the vehicle is used for 12 years. For other Mercedes cars, the distance is 241,000 km or 15 years of service.

Some manufacturers recommend that fluid from the engine cooling system should be rinsed, the cooling system rinsed, and the coolant changed at a faster rate on "heavy duty" cars, such as frequent towing operations, which can generate more engine heat.

For Chevrolet cars, the schedule for many of them is to change the fluid after 241,000 km, regardless of how the vehicle is used.

Many auto service stores say that changing the coolant should be done at a faster rate than the maintenance schedule recommends, that is, after every 48,000 km, or 80,000 km, for example.