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#3338073 - 04/09/14 07:16 PM No more Dex-Cool hysteria?
Nayov Online   content


Registered: 08/01/09
Posts: 815
Loc: ME
Has the formula for Dex-Cool been changed? The horror stories about "Death-Cool" seems to have abated.
Also, the most ubiquitous coolants are Dex clones AM, AM, deemed safe to use in any application. The app-specific coolants for the fanatics are essentially boutique coolants.

A little bit of obsessive thinking went into my selection of coolant for my Nissan, but in the end, I just grabbed Super-Tech; the "proper" choice would have been a so-called Asian formula.

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#3338081 - 04/09/14 07:26 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
ls1mike Offline


Registered: 06/14/08
Posts: 4183
Loc: In the Garage...
Most if not all of the GM cars now have a dry intake. Sometime around 04 the gaskets material was changed and problem went away. I do believe, at some point, the formula also under went a change.

I run it in all my stuff with no problems.
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#3338102 - 04/09/14 07:46 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
xxch4osxx Offline


Registered: 03/11/09
Posts: 2079
Loc: Cedarbrae, Ontario
Dexcool is an excellent coolant. I have it in my Silverado and there is no "dex-sludge" anywhere. Change at the recommended intervals and keep the system topped off and there will be no problems.
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#3338105 - 04/09/14 07:51 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
Chris142 Offline


Registered: 06/05/03
Posts: 13791
Loc: apple valley, ca
works fine with a pressurized bottle. i wont warranty my work if dex is used in a copper radiator or heater. i dont care what the naysayers say...dex will eat solder and cause a leak.
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#3338107 - 04/09/14 07:55 PM Re: No more Dex-Cool hysteria? [Re: Chris142]
Nayov Online   content


Registered: 08/01/09
Posts: 815
Loc: ME
Originally Posted By: Chris142
works fine with a pressurized bottle. i wont warranty my work if dex is used in a copper radiator or heater. i dont care what the naysayers say...dex will eat solder and cause a leak.


Well now you've got me worried. I have a brass and soldered transmission cooler in my radiator.
Can you elaborate?

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#3338111 - 04/09/14 07:56 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
faramir9 Offline


Registered: 06/01/12
Posts: 405
Loc: PA
I ran nothing but Dex-Cool in my '04 Chevy (Malibu) Classic and now only Dex-Cool in my 2000 Saturn SL1. The coolant itself is fine; it really does last longer, in my experience, though it's too soon to tell with the Saturn.

The problem was the combination of Dex and the plastic intake manifold gaskets on GM V-6s in the '90s till about 2003. Without the plastic gaskets, the "pink (or red) stuff" is fine. Some owners of affected vehicles will never use Dex again, and I don't blame them, based on GM's refusal-at-first to issue a recall. But Dex-cool with an engine/coolant system that can handle it is good stuff.
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#3338114 - 04/09/14 07:59 PM Re: No more Dex-Cool hysteria? [Re: xxch4osxx]
faramir9 Offline


Registered: 06/01/12
Posts: 405
Loc: PA
Originally Posted By: xxch4osxx
Dexcool is an excellent coolant. I have it in my Silverado and there is no "dex-sludge" anywhere. Change at the recommended intervals and keep the system topped off and there will be no problems.


Yep, topped-off is key. In fact, GM claimed that affected vehicles were neglected by owners who let the coolant run low---i.e. did not know via telepathy that the Full mark on the coolant surge bottle was like the E on the gas gauge....
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#3338126 - 04/09/14 08:11 PM Re: No more Dex-Cool hysteria? [Re: faramir9]
Trav Offline


Registered: 11/20/06
Posts: 13762
Loc: MA, Mittelfranken.de
IIRC the latest and best aluminum frame intake gaskets for the Gen ii were released around 08 or 09.
Before that was plastic frame inc FelPro replacements. Gen II engines repaired with the plastic frame gaskets continued to fail.
Gen III was introduced in 2004 with aluminum upper intake and different gasket it didn't suffer the issue as bad as the Gen II. The issue was put to be once and for all in 08.

The 3.1 and 3.4 suffered this ailment up to the end although the aftermarket offered a better problem solver intake gasket that seemed to be very effective.
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#3338156 - 04/09/14 08:31 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
Realtech214 Offline


Registered: 02/01/13
Posts: 659
Loc: Florida
Cant go wrong with dexcool or any amam coolant imo. I have used prestone dexcool but will use supertech amam in the future
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#3338172 - 04/09/14 08:39 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
crazyoildude Offline


Registered: 07/23/08
Posts: 8248
Loc: New Jersey
dex cool sludges engines so badly sometimes that we have to replace the radiators when we rebuild the engine if we are going to warranty it

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#3338186 - 04/09/14 08:50 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
Pablo Offline


Registered: 10/28/02
Posts: 46943
Loc: Duvall WA - Pacific NW USA
I think people quit buying into "it mixes with anything" hype, change it a bit more regularly and use it (mainly) in compatible systems. Early on, people ignored these things and didn't change over their cooling systems properly so they paid the horrendous "cost" of eaten radiators, leaks and death of other cooling system parts.

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#3338209 - 04/09/14 09:29 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
beast3300 Offline


Registered: 12/24/09
Posts: 3123
Loc: Ohio
Honestly I will never use it after the junk I see at work. G-05 based coolant has been flawless for me. I peeled the intakes off of 3 cars in a row that I owned and the intake was immaculate using the "Kameleon" G-05 from Safety Kleen we stock. Thanks but no thanks on the Dexcool.


Edited by beast3300 (04/09/14 09:30 PM)
Edit Reason: spelling
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#3338218 - 04/09/14 09:32 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
dishdude Offline


Registered: 11/14/08
Posts: 6524
Loc: Phoenix
The only Hysteria in my GM is a Def Leppard CD.

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#3338238 - 04/09/14 10:10 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
jrustles Offline


Registered: 02/24/13
Posts: 2035
Loc: Ontario, Canada
2-eha, don't need it, don't want it.

I can barely tell the level in the Pontiac's pressure bottle because of a thick opaque layer of pink scum from the original Dexcool
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#3338250 - 04/09/14 10:29 PM Re: No more Dex-Cool hysteria? [Re: Nayov]
Chris142 Offline


Registered: 06/05/03
Posts: 13791
Loc: apple valley, ca
Originally Posted By: Nayov
Originally Posted By: Chris142
works fine with a pressurized bottle. i wont warranty my work if dex is used in a copper radiator or heater. i dont care what the naysayers say...dex will eat solder and cause a leak.


Well now you've got me worried. I have a brass and soldered transmission cooler in my radiator.
Can you elaborate?
your trans cooler is silver soldered together. it should be ok. its our 60\40 radiator solder which is very soft that dex eats.
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