Recent Topics
49 years ago today....
by pbm
9 minutes 41 seconds ago
Why do we care so much about oil?
by camrydriver111
20 minutes 21 seconds ago
Which one should I sell/keep?
by SevenBizzos
Today at 12:18 PM
What's Shakin' at Amazon Today?
by TheLawnRanger
Today at 11:43 AM
2018 Hyundai Accent
by zeke1985
Today at 11:15 AM
Fresh footage of my Corvette on-track
by dparm
Today at 09:41 AM
Hedge trimmer "resin solvent"
by Rand
Today at 09:21 AM
Micrometer-digital
by Gito
Today at 09:00 AM
MMO and LSPI?
by KCJeep
Today at 08:49 AM
Sludged 2010 Cobalt 2.2 making noises
by jk_636
Today at 08:32 AM
Now oil pump while I have the pan off?
by callbay
Today at 07:19 AM
Anyone Remember DMSO Solvent ?
by LoneRanger
Today at 06:52 AM
aluminun bed in f150 pick um ups
by edwardh1
Today at 06:29 AM
Lawnmower 2cycle and 4cycle fuel
by Greaser73
Today at 04:00 AM
Rotella T6 5W40, 5000Mi, 1991 Ford 460 - RV
by MutantGarage
Today at 12:23 AM
2013 SUBARU Outback, M1EP 0w20, 14190mi, 74465 tot
by NO2
Yesterday at 11:52 PM
91 Ford 460 - noisy lifters at Idle when hot
by MutantGarage
Yesterday at 11:49 PM
Great deal on PP 5w30
by 60ampfuse
Yesterday at 11:48 PM
Motorcraft, 5W-30, 2425 miles, 2018 3.5 F EcoBoost
by cdlamb
Yesterday at 11:40 PM
Off-Road Trailer Tires
by troutfisher
Yesterday at 09:55 PM
Newest Members
TA128, Elantra16, Peterbilt52, CarllT100, 99SK04GTX
65515 Registered Users
Who's Online
93 registered (4WD, andyd, 2010Civic, AandPDan, 2004tdigls, 12 invisible), 1694 Guests and 30 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65515 Members
67 Forums
287355 Topics
4793903 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: 243
Loc: 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 - 265hrs
12 Jeep 3.8L - Toyota 5w30 63K
04 DMax 6.6L - Amsoil AME 15w40 226K
04 Tahoe 5.3L - Amsoil ASL 5w30 238K
00 WS6 5.7L - Amsoil ASL 5w30 254K

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: 12897
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.
_________________________
2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980

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: 5441
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: 5293
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: 918
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)
_________________________
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

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: 5758
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
#4599233 - 12/09/17 06:03 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: gallydif]
pbm Online   content


Registered: 04/19/04
Posts: 7643
Loc: 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'

Top
#4616092 - 12/27/17 06:02 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: pbm]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: 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

Top
Page 2 of 2 < 1 2