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Old 02-04-2013, 08:31 PM
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If you go to the auto parts store & look at the time/mileage recommendations
5 years or 150,000 miles, is what i believe it is
don't believe it for a second, iron engines & aluminum heads & aluminum radiator are very corrosive when put together
DEXCOOL should be changed sooner than 5 years


In the Cooling System

Regardless of the type of antifreeze used, the additive package will eventually break down and cease to provide adequate corrosion protection. The antifreeze will also pick up contaminants from the engine cooling system. In other words, antifreeze wears out and gets dirty. The service life for conventional green antifreeze is 2 years or 24,000 miles, and for OAT and HOAT is 5 years or 150,000 miles, and the manufacturers recommend fluid replacement at these intervals. However, although the antifreeze loses its corrosion protection and picks up contaminants, the ethylene glycol base does not break down and remains intact. In other words, the ethylene glycol retains its ability to lower the freeze point and raise the boiling point of the solution. This simple fact is the basis for the antifreeze recycling industry.



you may want to read this,
http://www.popularmechanics.com/cars...oducts/1272436
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