Recent Topics
Interesting Reads: Computer Scientists, SEs, CEs
by JeepWJ19
7 minutes 25 seconds ago
NAPA PROSELECT 27151, CUT OPEN TORN!!!
by car51
18 minutes 27 seconds ago
Changing ATF for first time
by Oilied
31 minutes 52 seconds ago
Remington circling the drain
by L_Sludger
45 minutes 52 seconds ago
any new car batteries with the built in hydrometer
by lexus114
52 minutes 19 seconds ago
Usps dropped the ball?
by aquariuscsm
Today at 01:31 PM
Kingsford 2-Pack 18.6-lb Charcoal Briquettes $9,88
by BigD1
Today at 01:28 PM
Cal-Ranch CCI Standard Velocity Deal
by billt460
Today at 12:39 PM
Lowest NOACK?
by AZjeff
Today at 12:05 PM
Anyone here attending Indy in person?
by sasilverbullet
Today at 11:58 AM
It looks like GM is called out.................
...

by demarpaint
Today at 11:38 AM
Old record players
by OVERKILL
Today at 11:26 AM
GMC Intellilink system playing music from SD card
by Sierra048
Today at 11:20 AM
Rassen Frassen Zama C1U K54 carb.clone
by andyd
Today at 11:13 AM
The world is full of injustices...
by Alex_V
Today at 10:55 AM
Experience with Felo?
by 2James1
Today at 10:38 AM
Is their an OBD2 app with advanced capabilities?
by 2James1
Today at 10:36 AM
It's started...
by Bailes1992
Today at 10:00 AM
Those trying to save environment,wind up hurting it
by Speak2Mountain
Today at 09:07 AM
Top Tier Gas a good choice for OPE?
by NH73
Today at 08:31 AM
Newest Members
Jes, hamm, Curlscurls, Regina, stuka
61656 Registered Users
Who's Online
70 registered (ammolab, AZjeff, A_Harman, Anduril, 455RACE, 28oz, 4 invisible), 2616 Guests and 12 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
61656 Members
66 Forums
265608 Topics
4389184 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 2 of 2 < 1 2
Topic Options
#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: 222
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 - 207hrs
04DMax 6.6L - Amsoil AME 15w40 203K
04Tahoe 5.3L - Amsoil ASL 5w30 219K
00WS6 5.7L - New to me 250K

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: 12395
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 Offline


Registered: 08/19/10
Posts: 3474
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: 4106
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.

_________________________
2007 Lincoln Navigator M1 0w-40/FU
1968 Charger R/T / Supercharged 440 VR1/DBL7349
2007 Ram 3500 4x4 / Cummins 6.7 /DBL7349
2015 Porsche 911 C4S PDK

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: 867
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
Page 2 of 2 < 1 2