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dexcool coolant
03-29-2011, 07:20 AM
Post: #1
dexcool coolant
I was advised to remove all the dexcool coolant from all my GM cars as the claim is this coolant eats the seals and turns to sludge overtime, the cars (olds and chevy) are serviced at intervals exceeding the manufacurer's recommendations and I am wondering if there are any experiences in the forum as the this claim of the coolant degrading as descibed. what are your thoughts??
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03-29-2011, 10:13 AM (This post was last modified: 03-29-2011 10:20 AM by Rupe.)
Post: #2
RE: dexcool coolant
I have a fleet of GM vehicles and my general observation is the Dexcool does not last forever and is not as forgiving as the old green stuff. OTOH, the old fashion coolant is not the same as it once was. IOW, there's no magic.

That said, either one will need to be flushed and replenished every few years to maintain the rust inhibitors. As long as there are no other major system issues you should get a reasonable service life out of everything with either type. When I say "not as forgiving" I did have one vehicle that developed a mucus plug in a heater hose with the Dexcool but after checking the records it had not been flushed properly since we had it and we bought it used. IOW, it fell between the cracks and that would probably not have happened if it was on schedule.

BTW, most of my fleet is older (pre 2005) and high mileage. (well over 100k and some over 200k) I have both types of cooolant in service with no obvious differences in the life of a water pump or radiator and have never replaced a hose in all the years I have been working on these vans.
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