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Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3050176 06/30/13 09:18 AM
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dhellman12 Offline OP
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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.


00 WS6 5.7L - Amsoil ASL 5w30 256K
04 DMax 6.6L - Amsoil AME 15w40 238K
12 Jeep 3.8L - Amsoil ASL 5w30 74K


Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3050404 06/30/13 01:14 PM
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901Memphis Offline
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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.


2012 Chevy Cruze LT 1.4T - 69k - M1HM 5w30 + Fram Ultra
2002 Buick Century 147k - Built 4T65e(Maxlife) - GTX 5w30 + Fram XG3980
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3373519 05/16/14 05:06 PM
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Kira Offline
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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

Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3475906 09/06/14 04:01 PM
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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
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Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3477091 09/07/14 10:15 PM
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simplistic Offline
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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
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: Bgallagher] #3864027 09/24/15 10:43 AM
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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

Last edited by gallydif; 09/24/15 10:46 AM.

09 Pontiac G8 GT 130k- Castrol + PP, ST 10060
96 Buick Roadmaster 103k- PP, ST filter
95 Roadmaster 53k- PP, ST filter
84 Caprice Landau 16k- MS5K 5w30, AC Delco
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8] #4573261 11/13/17 08:43 PM
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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
2006 Pathfinder 4X4
1991 BMW 735iL
"A fool and his money are soon parted" - Thomas Tusser
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: gallydif] #4599233 12/09/17 06:03 PM
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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 [/quote]


It sounds to me like somebody added Barsleaks or Genuine GM pellets (I believe Barsleaks makes the GM pellets).


'Journalism is Dead'
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: pbm] #4616092 12/27/17 06:02 PM
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My 1999 Camaro has original DexCool until 2012 when I changed it upon purchase from the orig owner. Everything looked fine except the coolant was a rather dirty orange/brown. Radiator was spotless. I've stuck with DexCool and change it every 4 yrs.


----------------

2001 Lincoln Cont 4.6L DOHC/ 50K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #5198093 08/27/19 01:51 PM
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Well if you truly want to keep your coolant system working good you should use the coolant recommended for your car, and do a coolant flush every 70,000-110,000 miles (depending on city or highway driving).

Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #5210108 09/11/19 11:39 AM
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interestingly to me but I went to my usual garage and asked what they charge to change the coolant in 2 of the vehicles I maintain: 2 liter Turbo and a 3 liter NA that are not near the mileage but are near the time the Owners Manual says the Dex-Cool should be changed...my mechanics told me it really isn't necessary to change it but they would if I really wanted too.

I've been using these guys for over 30 years, it it was really required, why wouldn't they take advantage of at least 2 coolant changes???...

I've done the other checks that I can on these cars, checked their pH, checked for electrolysis, and checked with the bulb type tester and they appear to be as new after 5 years each...

I've had Dex-Cool in my GM cars since 1999 (3.8 liter V6) and have never had an issue attributable to Dex-Cool...YMMV

Bill

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