The holts prestone coolant antifreeze concentrate can be mixed with any other colour of coolantantifreeze that is already in your car without causing any problems clogging or damage to the engine it is guaranteed for use with all makestypes of car it has been developed using engineered technology and tested in the most challenging conditions both hot and cold including the sahara so we know that it performs from 37c to 129c it has a concentrated formula so you can mix with water as and when n