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#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: 194
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.
04DMax 6.6L - Amsoil AME 15w40 180k
04Tahoe 5.3L - Amsoil ASL 5w30 187k

#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: 9141
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 118k - Built 4T65e - Peak 5w30/Fram TG 3387A
1998 Nissan Altima 335k - 5MT - M1 HM 5w30/Fram Ultra XG7317

#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: 1895
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

#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: 1767
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/LF9028
2007 Ram 3500 4x4 / Cummins 6.7 /LF9028
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#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

#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: 272
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)
2000 Lincoln Town Car 130k dd- 10w30 PUP, fram ultra
1996 Buick Roadmaster 58k LT1- 10w30 Castrol GTX dino, fram extra(before I knew they were garbage)

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