It is made from a propylene glycol base, which makes it less poisonous than conventional IAT for children and pets. Usually (but not always) dyed orange or yellow so you could tell the difference between OAT and IAT, this coolant has similar corrosion protection to the green stuff however, it is designed to be slower acting, hence the extended-life moniker. But because of the additives in the Dex-Cool orange antifreeze, you do not want to substitute the old reliable green coolant.
GM introduced Dex-Cool in 1995 as an "extended life" coolant, though most GM car owners and repair shops are finding that Dex-Cool is good for only about three to five years before it needs to be replaced. Chrysler used green IAT fluid until 2001, as did Ford (with the exception of some 1999 models that used OAT blue coolant which must be purchased from Ford).Ĭommonly referred in GM vehicles by the brand name, Dex-Cool or to other manufacturers as propylene glycol. IAT coolant was used in GM vehicles until 1994. Manufacturers recommended that you change the green IAT antifreeze every 36,000 miles or three years.
Ethylene glycol is its base chemical, and there are silicate and phosphate additives that make it compatible with copper, brass, cast-iron and aluminum cooling system components. This is the common green stuff original equipment manufacturers have used for over 70 years.
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