Recent Topics
Black Friday.... Heaven or [censored]?
by ZZman
11/24/17 08:21 AM
AC not working 2015 Charger compressor not working
by Blue_Goose
11/24/17 07:38 AM
Makeshift fuel hose bracket (Temporary fix)
by dlundblad
11/24/17 07:16 AM
Will PS4 Go Back to $199 Eventually After BF?
by LoneRanger
11/24/17 06:19 AM
Mobil1 Black Friday Sale
by BlueOvalFitter
11/24/17 04:45 AM
DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points
by The Critic
11/24/17 03:19 AM
Mixing 0W-20 Idemitsu and 10W-40=5W-30..?
by TurboTravis
11/24/17 01:53 AM
Valvoline at Meijer for Black Friday only.
by Eosyn
11/24/17 01:21 AM
Aurora - is that you ?
by Shannow
11/24/17 12:43 AM
Porter Cable 18V Tools - Upgrade to lithium batt
by Reddy45
11/23/17 11:51 PM
What ATF & periodicity for 2002 Camry 4 cyl?
by 69GTX
11/23/17 11:48 PM
Valvoline keep sodium for Gen2?
by lukejo
11/23/17 11:31 PM
Mobil Delvac 1 LE 5W-30
by bigj_16
11/23/17 11:07 PM
Mobil 1 AFE 0W20 Walmart $19.98 before rebate
by lukejo
11/23/17 09:40 PM
Whats the consensus on Castrol EDGE EP?
by AntDeek
11/23/17 08:48 PM
Why, just why?
by StevieC
11/23/17 08:07 PM
I want to replace AAA - response time is terrible!
by kpatter
11/23/17 06:58 PM
Wright tools
by Donald
11/23/17 05:25 PM
UltraPure Trumpet Valve OIl
by Al
11/23/17 05:19 PM
TV Types & Features Explained.
by StevieC
11/23/17 04:57 PM
Newest Members
deckm00, Cblove91, CarGuy99, bobcat, Skier
63481 Registered Users
Who's Online
71 registered (alarmguy, AVB, 4WD, Bamaro, Alex_V, AandPDan, 7 invisible), 1799 Guests and 20 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
63481 Members
66 Forums
274238 Topics
4558545 Posts

Max Online: 3590 @ 01/24/17 08:07 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: 234
Loc: Keller, 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.

_________________________
05 Kawasaki BF750 - 233hrs
04DMax 6.6L - Amsoil AME 15w40 208K
04Tahoe 5.3L - Amsoil ASL 5w30 222K
00WS6 5.7L - Amsoil ASL 5w30 251K

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: 12082
Loc: 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.


Edited by Rand (03/22/12 10:21 AM)
_________________________
2017 Jeep Cherokee Trailhawk V6

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: 6891
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(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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


Registered: 10/10/08
Posts: 18598
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 Offline


Registered: 10/10/08
Posts: 18598
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: 234
Loc: Keller, 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.
_________________________
05 Kawasaki BF750 - 233hrs
04DMax 6.6L - Amsoil AME 15w40 208K
04Tahoe 5.3L - Amsoil ASL 5w30 222K
00WS6 5.7L - Amsoil ASL 5w30 251K

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: 13774
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: 648
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: 6891
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(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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: 885
Loc: Fernandina Beach FL
Dex has not changed ,got that from Chevron Tech line last year.


Edited by Dan55 (04/15/12 07:43 AM)
_________________________
2016 Lexus NX200T 2017 Mustang Conv Eco Prem

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


Registered: 10/10/08
Posts: 18598
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: 2362
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.
_________________________
2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

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 Online   content


Registered: 04/17/12
Posts: 3131
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.
_________________________
2017 Chevy Traverse - 25k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 20k- Delco Dexos 1 and 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: 12705
Loc: Northern Kentucky
Is this the FF? How did the concentration end up so high?
_________________________
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
1998 Nissan Altima 337k - 5MT - M1 HM 5w30/Fram Ultra XG7317+MOS+ATP 205

Top
#3050176 - 06/30/13 10:18 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
dhellman12 Offline


Registered: 08/29/11
Posts: 234
Loc: Keller, TX
Not sure how the concentration ended up so high. We bought this one at 119K miles and had not touched the coolant until after this report.
_________________________
05 Kawasaki BF750 - 233hrs
04DMax 6.6L - Amsoil AME 15w40 208K
04Tahoe 5.3L - Amsoil ASL 5w30 222K
00WS6 5.7L - Amsoil ASL 5w30 251K

Top
#3050404 - 06/30/13 02:14 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
901Memphis Offline


Registered: 08/14/10
Posts: 12705
Loc: Northern Kentucky
Well then its doubtful its the FF Then. Someone probably did a drain and fill and used concentrate. Possibly they just replaced a bad overflow tank and filled it with concentrate.
_________________________
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
1998 Nissan Altima 337k - 5MT - M1 HM 5w30/Fram Ultra XG7317+MOS+ATP 205

Top
#3373519 - 05/16/14 06:06 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
Kira Online   content


Registered: 08/19/10
Posts: 4055
Loc: Champlain/Hudson Valley
Dex-Cool in a neglected 2003 Chevrolet S-10 (50K) 8K ago. Great shape
Dex-Cool in a "randomly topped off" 2005 Saab 9-5 (58K) 25K ago. Great shape
Dex-Cool in an "in service" 2002 Saab 9-3 (113K) 1K ago. Great shape
Dex-Cool in a "randomly topped off" 2002 Saab 9-5 (125K) 40K ago. Great shape

Cleanse as necessary. Rinse with distilled water. Use distilled water to dilute to spec (50%).
Dex-Cool is A-OK in my book. Kira

Top
#3475906 - 09/06/14 05:01 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
DoubleWasp Offline


Registered: 05/21/12
Posts: 4603
Loc: Fort Lauderdale, FL
I'd never put any of that stuff in anything I own, but in the trucks I maintain, it has performed flawlessly. Always replace the Dex with Dex when something goes down. I installed coolant filters on all of them, just for the extra safety measure.

_________________________
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

Top
#3477091 - 09/07/14 11:15 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
simplistic Offline


Registered: 07/31/13
Posts: 163
Loc: Tennessee
Originally Posted By: dhellman12
Not sure how the concentration ended up so high. We bought this one at 119K miles and had not touched the coolant until after this report.


During the service life of the coolant the water is boiled out. Every year I have to add 1-2qt's of water to my vehicles due to the water being 'cooked" out from the summer time heat. Example, I changed the coolant in my durmax. When I refiled and bleed the system out the ratio was 50/50. About 1 1/2 years later (30k miles) I was 2qts low on coolant. When I checked the ratio it was off a bit..over %60 dexcool. I added the water and that brought the ratio back down to what I had it set to.

Even some owners manuals say adding water up to 4 times a year is acceptable.
_________________________
03ccsb,2500hd 200k+ Durmax/Allison,PURE POWER FILTERS,Bilstin Shocks,Aux Springs,Swiss Cheese Air box Fram Tough Guard,BF Goodwrench K/O

Top
#3864027 - 09/24/15 11:43 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: Bgallagher]
gallydif Offline


Registered: 09/08/15
Posts: 876
Loc: Little Havana, Miami
Originally Posted By: Bgallagher
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.

+1. Dex cool started being put in in the '95-'96 vehicles don't remember exactly which one. When I bought my '96 roadmaster last year I did some research on dex cool since I had never had a car with the orange stuff before. And that's what I came across. Though the car was low mileage, I don't know how long it had been since the previous owner had done a coolant flush. Anyways, in the coolant reservoir I saw dark orange/brown pellets. Looked like some of it had turned into little balls of mud. My first thought was Oh No! I hope this hasn't ruined anything. And then I went ahead and did a coolant flush. I put in some new prestone dexcool and distilled water. Instead of doing it 50/50 though I made it about 65/35 (more dexcool then water).
On another note, I figure when you buy coolant that's already 50/50- it's not actually 50/50. They dilute it more than that. It's really 40/60 or 45/55


Edited by gallydif (09/24/15 11:46 AM)
_________________________
95 Caprice 61k LT1 dd- Shell Rotella T4 10w30, NAPA Silver
96 Buick Roadmaster 63k LT1- 4 qt 10w30 PUP, 1 qt M EP, NAPA Silver
00 Town Car- RIP 8/23/16

Top
#4573261 - 11/13/17 08:43 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8]
Bluestream Offline


Registered: 09/13/03
Posts: 5687
Loc: Waterloo, ON
Originally Posted By: SteveSRT8
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.


My daughters 2000 Cavalier had original Dex and it was fine.
_________________________
2000 VW Beetle 1.8T M5
2000 Ford Explorer 4.0 4X4
1991 BMW 735iL
"A fool and his money are soon parted" - Thomas Tusser

Top
Page 1 of 2 1 2 >