Recent Topics
2018 Ford Edge Oil Question
by Passport1 - 03/29/20 04:52 PM
Help school an engineer
by DriveHard - 03/29/20 04:47 PM
Broken sway bar bolt
by HoosierJeeper - 03/29/20 04:00 PM
can I use it?
by avi1777 - 03/29/20 03:54 PM
Service Champ OF2222 75% OLM, unknown miles
by bullwinkle - 03/29/20 03:50 PM
Gas Buddy Question
by Wolfshead - 03/29/20 03:30 PM
Caliper piston boot
by painfx - 03/29/20 03:25 PM
Graphene the next detailing protection
by Mamala Bay - 03/29/20 02:17 PM
Anyone here a blacksmith?
by 53' Stude - 03/29/20 02:13 PM
Buying products made outside the USA
by 007 - 03/29/20 01:22 PM
Marine oils on sale at Canadian Tire
by Snagglefoot - 03/29/20 12:42 PM
0W16 instead of 0w20?
by Mter00s - 03/29/20 12:36 PM
XG10575 Walmart.com deal
by 762fermeandyou - 03/29/20 12:29 PM
Virgin ACDelco PF1245 cut and post
by nwjones18 - 03/29/20 11:49 AM
Oups, forgot oil cap...
by M119 - 03/29/20 11:46 AM
Recommendation for tuned BMW N55?
by RIPGermanCastrol - 03/29/20 11:15 AM
Electrician's Help With Circuit Breaker ?
by doitmyself - 03/29/20 11:07 AM
Get your physicals done people
by BeerCan - 03/29/20 08:41 AM
2004 Silverado
by mjk - 03/29/20 08:29 AM
Shimmy on the Hiwy
by Char Baby - 03/29/20 06:06 AM
Newest Members
yulichris, jeff58, jimmyturner, ChainsawGuy, jbr
71038 Registered Users
Who's Online Now
107 registered members (007, 53' Stude, 2003f7, 2010Civic, 2oldtommy, 2K2AcuraTL, 8 invisible), 1,993 guests, and 20 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics303,324
Posts5,233,941
Members71,038
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Page 1 of 3 1 2 3
Have the "Dexcool" coolant flushed out of your GM vehicle... #5380913 03/20/20 06:17 AM
Joined: Aug 2019
Posts: 370
N
Navi Offline OP
OP Offline
N
Joined: Aug 2019
Posts: 370
Im in the livery business...used to own a Suburban...know a lot of people with these vehicles. The best thing you can do is get the "Dexcool" coolant flushed and replaced with Peak Global Lifetime. Pepboys seems best equipped around here to perform these fluid flushes.

Lets say you keep cruising with Dexcool mysterious problems will happen like a leak in the radiator...a leak in the coolant reservoir...etc...

GM has been having problems with Dexcool since they started using it in 1996.

https://www.consumeraffairs.com/news04/2006/08/gm_dexcool.html

Dexcool contains an aggressive plasticizer chemical. Peak Global Lifetime is the same coolant minus that chemical.

Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380918 03/20/20 06:35 AM
Joined: Apr 2017
Posts: 42
C
classic70 Offline
Offline
C
Joined: Apr 2017
Posts: 42
Have a 2003 suburban with 245,000K on it. Coolant has been changed twice in that time. Replaced with Dexcool. One water pump replaced because it started weeping. Still on original radiator. If you realized that it is not a lifetime coolant and change it when recommend it will be fine. Just my experience. I know some gm models had intake gasket issues... when combined with Dexcool turned to mud like substance.


2003 GMC Yukon 5.3 228k
1997 k1500 5.7 225k
1970 GMC C15 5.3 100k
2012 Honda Odyssey 118K
Big Stash
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380920 03/20/20 06:37 AM
Joined: Nov 2006
Posts: 23,164
T
Trav Offline
Offline
T
Joined: Nov 2006
Posts: 23,164
Many GM cars have been running dexcool for over 20 years with no issues whatsoever. Some engines had LIM gasket trouble but that was eventually resolved with aluminum frame gaskets, engines with dry intakes didn't have any such problems.
I have a few older Saab that used dexcool from day one and are perfectly clean inside the cooling passages and radiators, no bad gaskets or seals on these almost 20 year old cars, I cant see how it the "best thing" to do is change it for something else at this point.

On some engines I agree especially if it uses a wet intake or those known to have gasket issues with 2-EHA for those I use JD Cool Guard II.


ASE L1, Master. Deutsch Meisterbrief.
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380941 03/20/20 07:04 AM
Joined: Oct 2008
Posts: 4,365
F
Falcon_LS Offline
Offline
F
Joined: Oct 2008
Posts: 4,365
Back in '96, GM made the "mistake" of calling Dexcool a "lifetime" coolant. By the early 2000s, manifold gasket failures on the 3.1L/3.4L as well as 4.3L, 5.0L and 5.7L using plastic carrier gaskets with moulded silicone was common. The root cause was air in the system, which caused acid to form when mixed with the coolant and attacked plastic carrier gaskets. The plastic would soften, swell and eventually leak. Newer gasket material, primarily HNBR with aluminum frames addressed the problem, but until that point both GM and some aftermarket manufacturers were paying for warranty claims.

I, personally, have never had a problem with Dexcool. The LM7 5.3L I had on an old Avalanche didn't cause me any grief, nether did the LL8 4.2L in my Envoy, both of which have been running Dexcool since they left the factory. Whenever a cooling system repair was performed, e.g. thermostat or water pump, the system was thoroughly flushed and back flushed and refilled with premixed Dexcool. I no longer have the Avalanche, but I personally know the person who now has it with 293,000 miles now and he's got no issues with it either. I flushed out the factory coolant on the Envoy when I replaced the factory thermostat at 56,000 miles and again when I replaced the water pump at 115,000 miles. The system is still clean all round with zero issues at 135,000 miles, which is stil less than half that of the Avalanche.


Petro-Canada Duron HP 15W-40 CK-4/SN
99 Explorer: H17W02
00 Pajero: XG9688
01 Grand Marquis: XG2
05 Envoy: XG9837

Motorcraft 5W-50:
18 Mustang GT: XG10575
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380958 03/20/20 07:24 AM
Joined: Jun 2005
Posts: 345
J
jhs914 Offline
Offline
J
Joined: Jun 2005
Posts: 345
The Dex-Cool problem has not existed in decades. I have a 1999 GMC Sierra that has had it as the coolant all of it's life with no problems. I have a friend with a 2006 Silverado with well over 300,000 miles that has used nothing but Dex-Cool. He had to replace a water pump and the radiator but both went out at over 300,000 miles so you can't blame the coolant on that.

Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380965 03/20/20 07:33 AM
Joined: Jan 2013
Posts: 3,833
W
WyrTwister Offline
Offline
W
Joined: Jan 2013
Posts: 3,833
I think the Dexcool problem has been solved . But if you wish to change , go right ahead .


Wyr
God bless
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380968 03/20/20 07:34 AM
Joined: Mar 2004
Posts: 24,045
D
Donald Offline
Offline
D
Joined: Mar 2004
Posts: 24,045
Originally Posted by Navi
Im in the livery business...used to own a Suburban...know a lot of people with these vehicles. The best thing you can do is get the "Dexcool" coolant flushed and replaced with Peak Global Lifetime. Pepboys seems best equipped around here to perform these fluid flushes.

Lets say you keep cruising with Dexcool mysterious problems will happen like a leak in the radiator...a leak in the coolant reservoir...etc...

GM has been having problems with Dexcool since they started using it in 1996.

https://www.consumeraffairs.com/news04/2006/08/gm_dexcool.html

Dexcool contains an aggressive plasticizer chemical. Peak Global Lifetime is the same coolant minus that chemical.


Your article and the discussion of problems is very old news.

The net is Dexcool is excellent coolant. There were issues with a few engines that needed some new design gaskets. And you have to make sure cooling system is air tight. And change the coolant as listed in owners manual.

I would not use Dexcool in a vehicle where it came with something besides Dexcool from the factory.

A flush at PepBoys would likely get you a flush using tap water and universal coolant added. No thanks.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380971 03/20/20 07:38 AM
Joined: Dec 2002
Posts: 43,698
J
JHZR2 Offline
Global Moderator
Offline
Global Moderator
J
Joined: Dec 2002
Posts: 43,698
My 1998 S-10 still has all original cooling system component,s less the LIM gasket and the radiator cap.

Issue if maintained? Not so much. Certainly not 5e boogeyman some make it out to be.

Coolant always comes out beautifully clear.

Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380989 03/20/20 07:49 AM
Joined: Dec 2017
Posts: 6,150
S
Snagglefoot Offline
Offline
S
Joined: Dec 2017
Posts: 6,150
The others have handled the response well. I’ve had Dexcool in my Suburban’s rad for 12 years, changing every 5 years. 200,000 miles on the original rad, heater core, and water pump. coffee

Last edited by Snagglefoot; 03/20/20 08:19 AM.

If you want the job done right......do it yourself.
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380995 03/20/20 07:54 AM
Joined: Aug 2010
Posts: 7,441
K
Kira Offline
Offline
K
Joined: Aug 2010
Posts: 7,441
As "hands on and on top of things" people say they are, incorrect coolant is likely added to vehicles often....when you're not looking.
This can cause sludge.

An airtight system is a must, I've read.

I rinsed "Christmas Coolant" (red and green) from our 2005 Saab and restored with Dex-Cool & distilled.
We had crystal clear "Dex orange-red" through our ownership.

For the yokels who learned to say, "Death-Cool", there's no going back.
That's the trouble with headlines and bumper stickers.

Shame on the automotive industry for using the term "lifetime".

Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5380999 03/20/20 08:01 AM
Joined: Feb 2019
Posts: 719
R
Railrust Offline
Offline
R
Joined: Feb 2019
Posts: 719
Dexcool has been super reliable for over 15 years now.

[censored], I know some people that have NEVER changed their coolant in suburban sand Tahoe’s. Never. Going on almost 300,000 miles with one guy...opened the coolant tank and it smelt like fish. Said, you better change that. But he didn’t.


2018 Chevy Silverado 5.3
2007 Lexus LS460 (deceased)
2008 Honda CRV
(Whatever synthetic oil is on sale or rebate)
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5381002 03/20/20 08:02 AM
Joined: May 2005
Posts: 2,393
G
George7941 Offline
Offline
G
Joined: May 2005
Posts: 2,393
I have stayed with Dexcool in my Sierra and have no intentions of changing it out for another coolant. Dexcool has been changed twice so far. Original rad, water pump, heater core.


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5381011 03/20/20 08:08 AM
Joined: Jun 2008
Posts: 6,287
ls1mike Offline
Offline
Joined: Jun 2008
Posts: 6,287
I can't believe this still comes up. Dexcool hasn't been a problem in 15 years.
Everything I own runs it. Never had a problem with in the LS series of engines.
The problem was when it ran low and the intake gasket failed because it broke down. Then it would sludge up.
Problem was fixed in 04 on the 3800 engines.


Mike
00 Trans Am WS6 5.7 LS1
17 Silverado 3500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5381026 03/20/20 08:26 AM
Joined: Dec 2017
Posts: 6,150
S
Snagglefoot Offline
Offline
S
Joined: Dec 2017
Posts: 6,150
Even the comments on airtight are are probably a red herring. AFAIK, most or all cooling systems built in the last 20 years are air tight, using a sealed cap and pressurized coolant jug. Yes, my grandpa’s 73 Ford was not air tight. laugh


If you want the job done right......do it yourself.
Re: Have the "Dexcool" coolant flushed out of your GM vehicle... [Re: Navi] #5381030 03/20/20 08:33 AM
Joined: May 2014
Posts: 191
R
Randy_R Offline
Offline
R
Joined: May 2014
Posts: 191
Dexcool was good for 5 years 100,000 miles at first and then 150,000 miles. At six years I took my 2004 Silverado for a flush and was advised a flush was not necessary, drain the radiator and replace with new Dexcool. Another independent wrench told me he didn’t like Dexcool because it turns to jelly but admitted that was because owners never changed it. I had the Silverado 14 years and currently have a 2008 Saturn Vue and don’t have any problems with Dexcool. I also have an old Pontiac with a Griffin aluminum radiator and they recommend Dexcool. Every few years, drain what you can and replace with new. I buy a gallon of distilled water for less than $1 with every gallon of Dexcool and poor them both in a sprinkling can for a 50/50 mix.


2018 Mazda CX-5 6600 miles Zepro advanced moly 0W-20 Mazda filter
08 Saturn VUE AWD 3.5 V6 65,000 miles Schaeffer 9000 5W30 Wix 51522XP
65 Pontiac Tempest 355 Chevy Schaeffer Racing 10W30 K&N
Page 1 of 3 1 2 3
Previous Thread
Index
Next Thread

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