How often does the coolant need replacing?
There is no easy way to tell when coolant or corrosion inhibitor needs to be replaced. Don’t be tempted to judge coolant concentration just by it’s colour, as often it will appear to be alright even though the component of the mixture that protects your engine has been used up. It’s best to follow the vehicle manufacturer’s instructions regarding change intervals. Typically this is around every two years or 40,000km, but will vary.
