Recent Topics
do 5w-30 users ever with to thinner oils?
by edwardh1
05/05/15 05:45 AM
full covered hubcaps are they a universal fit
by alcyon
05/05/15 05:39 AM
Kinematic Viscsity above 100 C
by Daveonsub
05/05/15 04:40 AM
Texas Cartoon Post
by Dallas69
05/04/15 10:45 PM
air filter
by Dallas69
05/04/15 10:28 PM
Chevron Supr, 5w-30 SN, 8k, Subaru EJ25 2.5L
by dsr70
05/04/15 10:08 PM
Does cold weather cause oil consumption?
by HKPolice
05/04/15 09:53 PM
Bunch of filters cut
by holdorf333
05/04/15 09:45 PM
Battery prices
by wallyuwl
05/04/15 09:10 PM
Question about hths and relation to wear?
by 02s4audi
05/04/15 08:38 PM
O'Reilly PP or Castrol Edge with Wix
by BikeWhisperer
05/04/15 08:35 PM
Valvoline 5W-30, 7930 mi, 2003 Xterra - potassium?
by ScottyB
05/04/15 08:34 PM
Newest Members
harbinger, Diggy, Daveonsub, JLF, PJW1
53848 Registered Users
Who's Online
41 registered (bama7x57, alarmguy, Bandito440, Atesz792, 2002 Maxima SE, 77GrandPrix, 2 invisible), 867 Guests and 192 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
53848 Members
66 Forums
230810 Topics
3696108 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#2575929 - 03/22/12 10:11 AM GM Dex-Cool, 134K miles, 04 Chevy Tahoe
dhellman12 Offline


Registered: 08/29/11
Posts: 171
Loc: arlington, tx
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.

_________________________
04Dmax 6.6L - Amsoil AME 15w40 156k
04Tahoe 5.3L - Amsoil ASL 5w30 162k

Top
#2575946 - 03/22/12 10:19 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
Rand Offline


Registered: 08/20/03
Posts: 8616
Loc: Barberton,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.


Edited by Rand (03/22/12 10:21 AM)
_________________________
2015 Forester I-Premium 6MT

Top
#2575959 - 03/22/12 10:34 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
bullwinkle Offline


Registered: 10/09/04
Posts: 4562
Loc: 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 48RE SRW, 93 GMC C3500 6.2 diesel, 89 F-450 7.3 IDI, 98 Cherokee 4.0, 05 Scion xB, 12 Ford E-250 4.6

Top
#2575966 - 03/22/12 10:43 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
SteveSRT8 Online   content


Registered: 10/10/08
Posts: 16034
Loc: 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

Top
#2583490 - 03/29/12 11:20 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8]
Loobed Offline


Registered: 07/20/07
Posts: 3742
Loc: 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?




Edited by Loobed (03/29/12 11:21 AM)
_________________________
Engine: 2001 GM 5.3L LM7
Current Fill: Valvoline Synpower 5w-30 w/Pure-One PL25288 filter

I.M.N Oil Enthusiast

Top
#2583639 - 03/29/12 01:59 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
SteveSRT8 Online   content


Registered: 10/10/08
Posts: 16034
Loc: 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

Top
#2583755 - 03/29/12 03:27 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
dhellman12 Offline


Registered: 08/29/11
Posts: 171
Loc: arlington, tx
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.
_________________________
04Dmax 6.6L - Amsoil AME 15w40 156k
04Tahoe 5.3L - Amsoil ASL 5w30 162k

Top
#2588883 - 04/03/12 08:19 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8]
PandaBear Offline


Registered: 08/05/02
Posts: 12642
Loc: 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

Top
#2591439 - 04/06/12 04:37 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
RoGuE Offline


Registered: 02/05/08
Posts: 567
Loc: 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

Top
#2591981 - 04/06/12 06:41 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
bullwinkle Offline


Registered: 10/09/04
Posts: 4562
Loc: 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 48RE SRW, 93 GMC C3500 6.2 diesel, 89 F-450 7.3 IDI, 98 Cherokee 4.0, 05 Scion xB, 12 Ford E-250 4.6

Top
#2600019 - 04/15/12 07:43 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: PandaBear]
Dan55 Offline


Registered: 06/07/08
Posts: 729
Loc: jersey
Dex has not changed ,got that from Chevron Tech line last year.


Edited by Dan55 (04/15/12 07:43 AM)
_________________________
2010 TL 07 Fit Sport 05 Mazda 3S

Top
#2600131 - 04/15/12 10:59 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: PandaBear]
SteveSRT8 Online   content


Registered: 10/10/08
Posts: 16034
Loc: 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

Top
#2600342 - 04/15/12 04:08 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
xxch4osxx Offline


Registered: 03/11/09
Posts: 1812
Loc: 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.
_________________________
2004 Chev Silverado 4x4 using all Amsoil lubricants.
2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)


Top
#2787102 - 10/29/12 10:07 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8]
Bgallagher Offline


Registered: 04/17/12
Posts: 1404
Loc: 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.
_________________________
2005 Chevy Equinox - 129k - Penn. HM and AC PF52 (non e-core)
2005 Chevy Malibu - 150k - Valv. Maxlife and AC PF457G

Top
#3049956 - 06/30/13 01:40 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
901Memphis Offline


Registered: 08/14/10
Posts: 7474
Loc: Northern Kentucky
Is this the FF? How did the concentration end up so high?
_________________________
2002 Buick Century 108k - O'reilly HM 5w30/Fram Ultra XG 3980
Filter mag/Cooper CS5 GT/Wearever Platinum Ceramics
Triple Edge 4T65E/Maxlife Dex-Merc

Top
Page 1 of 2 1 2 >