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GM Dex-Cool, 134K miles, 04 Chevy Tahoe #2575929
03/22/12 09:11 AM
03/22/12 09:11 AM
Joined: Aug 2011
Posts: 252
Texas
dhellman12 Offline OP
dhellman12  Offline OP
Joined: Aug 2011
Posts: 252
Texas
This was the other 2004 coolant sample that I submitted. According to the little prestone tester, this fluid was in better shape than the diesel pickup (5 of 5 balls floating). Obviously there is a lot missing from the hand held tests.

Will be replacing the fluid this weekend with either Valvoline Maxlife or Amsoil coolant.



05 Kawasaki BF750 - 277hrs
12 Jeep 3.8L - Amsoil ASL 5w30 68K
04 DMax 6.6L - Amsoil AME 15w40 230K
00 WS6 5.7L - Amsoil ASL 5w30 254K
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #2575946
03/22/12 09:19 AM
03/22/12 09:19 AM
Joined: Aug 2003
Posts: 13,140
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,140
NE,Ohio
the balls tell you antifreeze concentration.. nothing about actual condition..

usually with those style testers 1 is weak 2-- is kinda week

3-4 good.. 5= too much antifreeze not enough water.



I'd say the coolant is worn out and needs replaced asap.

Last edited by Rand; 03/22/12 09:21 AM.

2019 Jeep Cherokee Trailhawk 2.0T
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #2575959
03/22/12 09:34 AM
03/22/12 09:34 AM
Joined: Oct 2004
Posts: 8,319
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,319
Cincinnati, OH, USA
I'd also suggest sticking with distilled (cheap at WM) water or reverse osmosis filtered water to get the minerals out. Wonder how the concentration got so high? Topping off with straight Dex only?


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #2575966
03/22/12 09:43 AM
03/22/12 09:43 AM
Joined: Oct 2008
Posts: 19,197
Sunny Florida
SteveSRT8 Online content
SteveSRT8  Online Content
Joined: Oct 2008
Posts: 19,197
Sunny Florida
Why change coolant?

There's absolutely nothing wrong with Dexcool in a properly set up and maintained system.


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8] #2583490
03/29/12 10:20 AM
03/29/12 10:20 AM
Joined: Jul 2007
Posts: 3,742
Northern California, USA
Loobed Offline
Loobed  Offline
Joined: Jul 2007
Posts: 3,742
Northern California, USA
Originally Posted By: SteveSRT8
Why change coolant?

There's absolutely nothing wrong with Dexcool in a properly set up and maintained system.


Dexcool is suppose to be changed every 5 years or 150k miles.


P.S. Where did the copper come from?



Last edited by Loobed; 03/29/12 10:21 AM.

Engine: 2001 GM 5.3L LM7
Current Fill: Valvoline Synpower 5w-30 w/Pure-One PL25288 filter

I.M.N Oil Enthusiast
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #2583639
03/29/12 12:59 PM
03/29/12 12:59 PM
Joined: Oct 2008
Posts: 19,197
Sunny Florida
SteveSRT8 Online content
SteveSRT8  Online Content
Joined: Oct 2008
Posts: 19,197
Sunny Florida
well it sure didn't come out of an all aluminum and plastic radiator!

We run dex in factory filled fleet vehicles to component failure, and it's almost always more than 150k miles.

Never a problem. EVER.

Dex used to have issues but it flat out does not anymore. Even Ford is using it now.


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #2583755
03/29/12 02:27 PM
03/29/12 02:27 PM
Joined: Aug 2011
Posts: 252
Texas
dhellman12 Offline OP
dhellman12  Offline OP
Joined: Aug 2011
Posts: 252
Texas
Went back with the Amsoil antifreeze (& Wally distilled water) in this one. Cost was $8 higher and it's supposed to last for 7yrs or 250k miles. If nothing else will be good to compare that to the factory fill of Dex cool.

Agreed on the Dex coolant, both of my vehicles are 2004 and were running factory fill. The Tahoe showed it needs to be changed, the Duramax was still good (@ 8yrs & 117K miles). Don't think there is anything wrong with Dex Cool, just thought I'd try something else and see how it performs.


05 Kawasaki BF750 - 277hrs
12 Jeep 3.8L - Amsoil ASL 5w30 68K
04 DMax 6.6L - Amsoil AME 15w40 230K
00 WS6 5.7L - Amsoil ASL 5w30 254K
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8] #2588883
04/03/12 07:19 PM
04/03/12 07:19 PM
Joined: Aug 2002
Posts: 14,564
Silicon Valley
PandaBear Offline
PandaBear  Offline
Joined: Aug 2002
Posts: 14,564
Silicon Valley
Originally Posted By: SteveSRT8
Dex used to have issues but it flat out does not anymore. Even Ford is using it now.


Did they reformulate it? or did the cooling system design change?


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #2591439
04/06/12 03:37 AM
04/06/12 03:37 AM
Joined: Feb 2008
Posts: 683
Atlanta, GA
RoGuE Offline
RoGuE  Offline
Joined: Feb 2008
Posts: 683
Atlanta, GA
I drained out factory coolant from the radiator on my sister 2002 Tahoe (just hit 60k miles) and it has a very noticeable...odor. Can't quite say what it is, but I figured it was time to change it. I'd love to test it but don't have the money to spare.


2007 Chevrolet Malibu
2.2L Ecotec
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #2591981
04/06/12 05:41 PM
04/06/12 05:41 PM
Joined: Oct 2004
Posts: 8,319
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,319
Cincinnati, OH, USA
If standard green AF is added to Dex it'll stink something awful (and start gelling up)-just make sure you flush the devil out of it.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: PandaBear] #2600019
04/15/12 06:43 AM
04/15/12 06:43 AM
Joined: Jun 2008
Posts: 899
Fernandina Beach FL
Dan55 Offline
Dan55  Offline
Joined: Jun 2008
Posts: 899
Fernandina Beach FL
Dex has not changed ,got that from Chevron Tech line last year.

Last edited by Dan55; 04/15/12 06:43 AM.

2016 Lexus NX200T 2017 Mustang Conv Eco Prem
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: PandaBear] #2600131
04/15/12 09:59 AM
04/15/12 09:59 AM
Joined: Oct 2008
Posts: 19,197
Sunny Florida
SteveSRT8 Online content
SteveSRT8  Online Content
Joined: Oct 2008
Posts: 19,197
Sunny Florida
Originally Posted By: PandaBear
Originally Posted By: SteveSRT8
Dex used to have issues but it flat out does not anymore. Even Ford is using it now.


Did they reformulate it? or did the cooling system design change?


As noted above^^^ it appears to be the same formula.

The real problem was gaskets. Dex isn't the big stinker the Internet has portrayed it as.


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #2600342
04/15/12 03:08 PM
04/15/12 03:08 PM
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
xxch4osxx Offline
xxch4osxx  Offline
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
The cooling system in my 2004 Silverado is spotless and has had Dex the whole time. I had thought about changing it to something else, but decided not too as obviously the Dex was doing a good job.


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8] #2787102
10/29/12 09:07 AM
10/29/12 09:07 AM
Joined: Apr 2012
Posts: 3,159
Boston, MA
Bgallagher Offline
Bgallagher  Offline
Joined: Apr 2012
Posts: 3,159
Boston, MA
Originally Posted By: SteveSRT8
Originally Posted By: PandaBear
Originally Posted By: SteveSRT8
Dex used to have issues but it flat out does not anymore. Even Ford is using it now.


Did they reformulate it? or did the cooling system design change?


As noted above^^^ it appears to be the same formula.

The real problem was gaskets. Dex isn't the big stinker the Internet has portrayed it as.


+1 Dex is EXCELLENT at keeping cooling systems clean but once a foreign coolant or air is introduced it can cause issues. The issues with the older vehicles were that the acids used in Dexcool would eat away at the gasket material (namely the Lower Intake and Head gaskets.) For the cars that experienced this, AC Delco and other have created new gaskets that are made of materials that wont corrode. Essentially fixing the issue. The only issue is that so many people are afraid of it and frankly I would chaulk it up to their ignorance. If you are truely worried I would switch to Peak Global.


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3049956
06/30/13 12:40 AM
06/30/13 12:40 AM
Joined: Aug 2010
Posts: 12,906
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,906
Northern Kentucky
Is this the FF? How did the concentration end up so high?


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
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