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A question for the experts about Dexcool
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Atlas
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PostPosted: Sun Jan 29, 2012 4:46 pm    Post subject:  A question for the experts about Dexcool Reply with quote

Does anyone know about any problems with using Dexcool coolant ? I've come across a few comments on the web that state that it is hard on the cooling system. Have any of you had issues with it ?

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PostPosted: Sun Jan 29, 2012 4:59 pm    Post subject:  Dexcool . . . Reply with quote

A question for the experts . . . boy are you opening a can of worms. What makes us experts? We, well I, can offer my findings and advice and there are many posts here on this subject.
I have flushed, added water, run the car a day or so. Repeated three or so times. Then filled with new antifreeze and distilled water. I used the Super Tech (Walmart) brand. I think it's made by or for Quaker state.
As I have said B4. If you read the contents of the stuff (Prestone, GM Dexcool, Super Tech etc) on the shelves at Walmart. They all contain the same ingredients word for word.
Dexcool got a bad name because of inferior gasket material allowing air into the system and causing coagulation problems. That was the old stuff. New technology brings a better product, so Dexcool is OK. Me, I want whats good to keep my car running at a fair price, hence the Super Tech brand. And so far so good. Time will tell. Any one else care to tell their story? Cool

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PostPosted: Sun Jan 29, 2012 7:10 pm    Post subject:   Reply with quote

I'm running Dexcool right now in my Impala with no problems. As topgun stated it was poor gasket material that caused the problem with Dexcool.

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PostPosted: Sun Jan 29, 2012 7:34 pm    Post subject:   Reply with quote

Also make sure to bleed the air out. Dexcool is fine, people love to blame it but that doesn't make them right

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PostPosted: Sun Jan 29, 2012 10:06 pm    Post subject:   Reply with quote

Okay thanks guys, as to the word "expert",well to me it's anyone that has experience with the stuff which is far more than I have. The only thing that it reminds me of is the coolant in my International diesel engine, but it's specific to diesels. Thanks for your input though,I can put my mind at ease. Impala

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PostPosted: Mon Jan 30, 2012 9:55 am    Post subject:   Reply with quote

I don't let Dexcool sit as long as GM says it can. I refuse to leave a system alone for 5 years haha.

Just keep routine maintenance on it, and like everything else it should last you.

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PostPosted: Mon Jan 30, 2012 12:18 pm    Post subject:   Reply with quote

chibiblacksheep wrote:
I don't let Dexcool sit as long as GM says it can. I refuse to leave a system alone for 5 years haha


Same here. I think part of the problem with Dex is the 5 year statement by GM. A lot of people read that as you can totally forget about the coolant system for 5 years and there won't be a problem.

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PostPosted: Mon Jan 30, 2012 2:00 pm    Post subject:   Reply with quote

I guess my question is , why not just replace it with regular green glycol type anti-freeze when it needs to be changed ?

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PostPosted: Mon Jan 30, 2012 3:13 pm    Post subject:   Reply with quote

Atlas wrote:
I guess my question is , why not just replace it with regular green glycol type anti-freeze when it needs to be changed ?


Because if the green and dex mix it creates a very nasty liquid. So you have to be 100% sure you will get all of the dex out of your system before dropping green in.

Or you can just put dex back in, and treat it like you would the green.

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PostPosted: Mon Jan 30, 2012 3:15 pm    Post subject:   Reply with quote

I always use the prestone yellow in my cars, it won't cause any problems if you mix it with dexcool.

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PostPosted: Mon Jan 30, 2012 9:59 pm    Post subject:  coolant . . . Reply with quote

For Atlas and others . . . About 'just using the green stuff'.
The bad news is that it doesn't come down to color matching. Isn't all antifreeze compatible? Sorry, but it isn't. There are a few cases where you can get a fast case of corrosion, some where the water pump can be both eroded and corroded to an early death, and a lot of cases where you can shorten the effective life of the antifreeze. Antifreeze itself (most commonly a chemical called ethylene glycol) doesn't wear out–ever–but the key ingredients are the rust and corrosion inhibitors, and they get used up. The most common inhibitors, silicates for aluminum protection, are used up faster than others. That's why some new cars (all General Motors, Mercury Cougar, VW/Audi models) have red or orange antifreeze with a new class of inhibitors, called organic acids. Examples of U.S. brands with these organic acids: Havoline Dex-Cool and Prestone Extended Life, both recommended for five years or 150,000 miles. That's the good news.
But still change it every 4 years to be safe. Cool

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PostPosted: Mon Jan 30, 2012 10:02 pm    Post subject:   Reply with quote

Would be nice if you cited your source...

http://www.popularmechanics.co.....ts/1272436

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PostPosted: Mon Jan 30, 2012 10:23 pm    Post subject:   Reply with quote

Man, I think I'll just stay with the dexcool and keep an eye on it . Changing it every 4 years or so isn't that bad. It sounds like this antifreeze is designed to work in these engines and I may as well leave well enough alone. You know I've learned something here, I've never really thought about the different types of antifreeze and the problems they can cause if you don't get the right kind , but I'm thinking about it now.
All I've ever used is the green ,except of course the red stuff for the diesels. I was really behind the times Shocked

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PostPosted: Mon Jan 30, 2012 10:33 pm    Post subject:   Reply with quote

Atlas wrote:

All I've ever used is the green ,except of course the red stuff for the diesels. I was really behind the times Shocked


Don't feel too bad, I was helping me neighbor with her car that was leaking something blue. I had no idea it was blue coolant until I smelled it. Hell, she thought it was leaking windshield washer fluid (and I can't blame her for thinking so).

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PostPosted: Wed Feb 08, 2012 9:51 am    Post subject:   Reply with quote

In the old days, silicate was the primary corrosion inhibitor. It forms a film on the metal surface (and thus used up). All silicate based coolants needed to be replaced yearly.

GM/Dexcool replaced silicate with organic materials. The new corrosion inhibitor doesn't form a film on the metal and is not used up. It stays in the coolant. As far as the metal is immersed in the coolant, no corrosion. 5 year 15k miles comes from this.

There is one problem with this new breed of coolant. Air leak into the cooling system and coolant level drop (thus loss of full immersion). In the old days, silicate film was covering the metal, providing corrosion protection whether fully immersed or not. Not so with the new breed of coolant. 5 year 15k miles relieves us from replacing coolant every year for 5 years, not from checking coolant level constantly.

Someone mentioned leaky gasket giving Dexcool a bad taste. If your car is leaky and you cannot fix the problem, use the old silicate coolant.

If your system is tight, no reason not to switch to Dexcool and benefit from the new coolant. Fill 1/2 capacity with 100% Dexcool first. Residual silicate from old green coolant is not going to bother Dexcool.

Still another kind of coolant. It has Dexcool type corrosion inhibitor plus a slight amount of film-forming inhibitor (silicate for instance). G-05 is an example. Many Fords and European (Asian also) use this kind.

I hope I simplified the Popular Mechanics article.
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