Coolant is the generally accepted term for the liquid that absorbs heat from the engine and releases it through the radiator. As the coolant circulates through the system it transfers heat to the radiator and into the air. The liquid is cooled, fed back to the engine through the cooling system, and the cycle repeats. Coolant should be checked for both Ph levels and strength at regular intervals and serviced accordingly. Even so called long-life coolants have been known to lose their effectiveness prematurely. See your owners manual or call one of our service advisers for more information. Low and used coolant also causes your vehicle to be less fuel efficient. In some cases this can decrease your miles per gallon by up to 10%. If your coolant is left unchanged for too long may result in a chemical condition known as electrolysis, this can result in costly repairs or even an engine replacement. From a safety standpoint an overheated engine won't pose a problem for other motorists, but could leave you stranded with no warning. From an environmental point of view, there is significant impact. Because leaking engine coolant is poisonous and could be ingested by children, pets and other animals.