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Originally Posted by bmwm750
... apparently to no point as the old coolant came out crystal clear so probably didnt need to be done...
Patrick
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Hi,
Not necessarilty true. Coolant can undergo several chemical changes as it ages, reacts with the various materials used in the Cooling System, etc. Generally, Coolant increases in Acidity as it ages because of this. This fluid now has a greater ability to attack the Cooling System components. For this reason alone (though there are others), it's worthwhile to change the Coolant every 5yrs. or 150k mi. Hope this helps...
Happy Motoring!... Jim'99
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