Recent Topics
ST Conventional SN Plus
by motorguy222. 10/19/18 02:42 AM
schaefferoil or Amsoil
by s2krunner. 10/19/18 02:29 AM
Pennzoil conventional oil meets api sn plus
by chris_84. 10/18/18 11:45 PM
TGMO in new Honda turbos?
by BTLew81. 10/18/18 11:26 PM
'02 Explorer Sport Trac: 302k mile update
by 14Accent. 10/18/18 10:43 PM
BMW 335 Quick Coolant Change
by antonmnster. 10/18/18 09:58 PM
190k miles
by Marco620. 10/18/18 09:56 PM
tire rotation/jack location
by mobilaltima. 10/18/18 09:23 PM
Apparently I'm not allowed to...
by BMWTurboDzl. 10/18/18 08:41 PM
2014 Cruze 2.0, AMSOIL DHD 7k miles 68k total
by Rat407. 10/18/18 08:32 PM
Stabilizer needed for 5-6 month storage?
by Quattro Pete. 10/18/18 08:29 PM
Clearance ST filter cut open
by barkingspider. 10/18/18 07:56 PM
0W20 Required for Jeep Auto Stop/Start
by harbor. 10/18/18 05:42 PM
School buses + Colder Temps = MPG Nosedive
by RayCJ. 10/18/18 05:20 PM
Meguiars Wax
by dslofti. 10/18/18 04:41 PM
Newest Members
Whyssosseriouss, TNflash, The74impala, Ryan1122, ston123
66244 Registered Users
Who's Online Now
24 registered members (BlakeB, Dan55, Bailes1992, earlyre, Geauxtiger, Duke, 2 invisible), 798 guests, and 33 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics292,163
Posts4,875,177
Members66,244
Most Online2,494
Oct 17th, 2018
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Page 2 of 2 1 2
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3050176
06/30/13 10:18 AM
06/30/13 10:18 AM
Joined: Aug 2011
Posts: 249
Texas
dhellman12 Offline OP
dhellman12  Offline OP
Joined: Aug 2011
Posts: 249
Texas
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 - 271hrs
12 Jeep 3.8L - Amsoil ASL 5w30 65K
04 DMax 6.6L - Amsoil AME 15w40 229K
04 Tahoe 5.3L - Amsoil ASL 5w30 239K (Sold)
00 WS6 5.7L - Amsoil ASL 5w30 254K
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3050404
06/30/13 02:14 PM
06/30/13 02:14 PM
Joined: Aug 2010
Posts: 12,906
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,906
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.


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3373519
05/16/14 06:06 PM
05/16/14 06:06 PM
Joined: Aug 2010
Posts: 5,734
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,734
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

Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3475906
09/06/14 05:01 PM
09/06/14 05:01 PM
Joined: May 2012
Posts: 5,512
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,512
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
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12] #3477091
09/07/14 11:15 PM
09/07/14 11:15 PM
Joined: Jul 2013
Posts: 163
Tennessee
simplistic Offline
simplistic  Offline
Joined: Jul 2013
Posts: 163
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
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: Bgallagher] #3864027
09/24/15 11:43 AM
09/24/15 11:43 AM
Joined: Sep 2015
Posts: 921
Little Havana, Miami
gallydif Offline
gallydif  Offline
Joined: Sep 2015
Posts: 921
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

Last edited by gallydif; 09/24/15 11:46 AM.

96 fleetwood 63k dd- MaxLife 5w30, AC Delco pf52
95 Caprice 67k LT1 dd- Mag1 dino 5w30, same ^
84 Caprice Landau 14k- MS5K 5w30, AC D pf454
96 Buick Roadmaster 65k- RIP ‘17
00 Town Car- RIP ‘16
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8] #4573261
11/13/17 09:43 PM
11/13/17 09:43 PM
Joined: Sep 2003
Posts: 5,774
Waterloo, ON
Bluestream Offline
Bluestream  Offline
Joined: Sep 2003
Posts: 5,774
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
Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: gallydif] #4599233
12/09/17 07:03 PM
12/09/17 07:03 PM
Joined: Apr 2004
Posts: 7,757
New York
pbm Offline
pbm  Offline
Joined: Apr 2004
Posts: 7,757
New York
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 07:02 PM
12/27/17 07:02 PM
Joined: Sep 2015
Posts: 3,886
Connecticut
69GTX Offline
69GTX  Offline
Joined: Sep 2015
Posts: 3,886
Connecticut
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/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Page 2 of 2 1 2

BOB IS THE OIL GUY® Powered by UBB.threads™