The coolant stops flowing through the system, clogs up coolant passageways and water jackets, radiators, and heater cores. The water pump overheats and fails due to a lack of lubricant in the coolant.

OAT antifreeze has a longer lifespan than its green counterpart, often lasting up to 50,000 miles. However, routine checks are still crucial to ensure it's functioning as intended.

Cars born with green coolant shouldn't be changed to orange. It's also a bad idea to mix the two. Plus a few other things you should know.

It's Hyperzero UV Green is the cheapest coolant on test too at just £5.98 - probably less than you'd pay for a 3L container of deionised water and additive when you factor in postage costs.

Since it works with "Green" coolant, so I don't have to completely flush the system when I changed over. So far so good. Also if you are doing it yourself, add a bottle of water wetter.

The principal reason for the different anti-freeze colours is that green is commonly used to identify the older type of antifreeze and orange the newer long-life or extended-use antifreeze.

It's 2002. Do you know where your corrosion inhibitors are? Some folks take the yawn approach to what goes on between consenting chemicals in the steamy privacy of a car's cooling system. Not me. And ...