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#3202757 - 12/01/13 10:34 AM Changing Dexcool Too Soon?
Aurora09 Offline


Registered: 12/31/11
Posts: 69
Loc: Saint Clair, MI USA
Hi Everyone,

I'm interested to know if I should bother changing my Dexcool after 30,000 miles and two and a half years after it was last changed? I'm sure it's fine, but I was thinking about doing it strictly to extend the life of the cooling system.
_________________________
1994 Jeep Grand Cherokee Laredo. 4.0 six cylinder. 266,000 miles. Fram orange filter, service pro 10W30 oil.

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#3202764 - 12/01/13 10:43 AM Re: Changing Dexcool Too Soon? [Re: Aurora09]
NMBurb02 Offline


Registered: 09/12/12
Posts: 1930
Loc: Crowntown, CA
It is sooner than needed, but won't hurt anything. Be prepared for responses saying not to refill with Dexcool because it is evil and will eat your engine from the inside out.
_________________________
2002 Chevy Suburban 1500, G-Oil 5W-30, Fram TG3675
2006 Pontiac Grand Prix GT, M1 0W-40, Fram TG3387A

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#3202771 - 12/01/13 10:48 AM Re: Changing Dexcool Too Soon? [Re: NMBurb02]
Aurora09 Offline


Registered: 12/31/11
Posts: 69
Loc: Saint Clair, MI USA
I have heard that before, but I chalked it up to an old wives tale amongst old-timer mechanics from back when Dexcool was first introduced and cars maybe had other problems or idiots mixed it with green coolant.
_________________________
1994 Jeep Grand Cherokee Laredo. 4.0 six cylinder. 266,000 miles. Fram orange filter, service pro 10W30 oil.

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#3202797 - 12/01/13 11:15 AM Re: Changing Dexcool Too Soon? [Re: Aurora09]
JHZR2 Offline



Registered: 12/14/02
Posts: 38118
Loc: New Jersey
Someplace I read that some of the newer chemistries leave a passivating layer on materials, and so they shouldn't be disrupted. i think that was related to one of the G12 or G12+/++ variants, not entirely sure...

But IMO you can't go wrong replacing the inhibitors, so long as you don't mind the work. Personally, Id probably let it go another year or so before changing, but I doubt you're doing any harm...

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#3202827 - 12/01/13 11:50 AM Re: Changing Dexcool Too Soon? [Re: Aurora09]
ls1mike Offline


Registered: 06/14/08
Posts: 4226
Loc: In the Garage...
I change the Dex in my cars that have a wet intake every 30,000 along with the cap. You won't hurt it.
Your car has a wet intake.
_________________________
Mike
00 Trans Am 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#3202836 - 12/01/13 11:57 AM Re: Changing Dexcool Too Soon? [Re: ls1mike]
yonyon Offline


Registered: 03/06/12
Posts: 3492
Loc: NJ, USA
Are you sure? I thought all Northstars had a dry intake.

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#3202845 - 12/01/13 12:06 PM Re: Changing Dexcool Too Soon? [Re: Aurora09]
Petersubaru Offline


Registered: 01/24/10
Posts: 235
Loc: Canada
I just drain the coolant from the rad and then re-fresh with new every 3-4 yrs..no problem with dex from havoline...

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#3202848 - 12/01/13 12:11 PM Re: Changing Dexcool Too Soon? [Re: Aurora09]
cchase Offline


Registered: 11/03/09
Posts: 4018
Loc: New England
Originally Posted By: Aurora09
I have heard that before, but I chalked it up to an old wives tale amongst old-timer mechanics from back when Dexcool was first introduced and cars maybe had other problems or idiots mixed it with green coolant.


I think you hit the nail on the head.

1) other problems
2) people mixing/running very low levels

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#3202872 - 12/01/13 12:43 PM Re: Changing Dexcool Too Soon? [Re: cchase]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 17511
Loc: Sunny Florida
Originally Posted By: cchase
Originally Posted By: Aurora09
I have heard that before, but I chalked it up to an old wives tale amongst old-timer mechanics from back when Dexcool was first introduced and cars maybe had other problems or idiots mixed it with green coolant.


I think you hit the nail on the head.

1) other problems
2) people mixing/running very low levels


More than likely. We routinely run ours until a component fails, and on the newer V8's we run that is a LONG time even in 3500 series vans.

Thank goodness some of the Dex myth is finally dying out a bit. But I still get quite a bit of stuff every time I defend it...
_________________________
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix

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#3202891 - 12/01/13 12:54 PM Re: Changing Dexcool Too Soon? [Re: Aurora09]
cronk Offline


Registered: 01/06/09
Posts: 902
Loc: Watertown, New York
If I recall correctly, isn't the proper interval for Dexcool:
1st change 5 years or 100k
Then 3 years 60k on subsequent changes.
_________________________
1998 GMC C1500
1999 Saturn SL2
2011 Nissan Quest
1986 Pontiac Trans Am
1940 Ford 9N Tractor

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#3202896 - 12/01/13 01:01 PM Re: Changing Dexcool Too Soon? [Re: Aurora09]
Donald Offline


Registered: 03/21/04
Posts: 16950
Loc: Upstate NY
Originally Posted By: Aurora09
Hi Everyone,

I'm interested to know if I should bother changing my Dexcool after 30,000 miles and two and a half years after it was last changed? I'm sure it's fine, but I was thinking about doing it strictly to extend the life of the cooling system.


Spend your money on some Christmas presents. Let it go to 60K or 5 years assuming it looked clean.

The only issue with Dexcool is when air gets into the system on a continuous basis. That can be gaskets failing, or radiator cap failing or using Dexcool in a vehicle where it was not designed for it.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2001 Jeep Grand Cherokee Laredo 4.0- sold
1999 Dodge Ram 2500 w/Cummins- 4-sale


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#3202899 - 12/01/13 01:05 PM Re: Changing Dexcool Too Soon? [Re: JHZR2]
Donald Offline


Registered: 03/21/04
Posts: 16950
Loc: Upstate NY
Originally Posted By: JHZR2
Someplace I read that some of the newer chemistries leave a passivating layer on materials, and so they shouldn't be disrupted. i think that was related to one of the G12 or G12+/++ variants, not entirely sure...

But IMO you can't go wrong replacing the inhibitors, so long as you don't mind the work. Personally, Id probably let it go another year or so before changing, but I doubt you're doing any harm...


I believe all coolants leave a layer on the cooling system materials for protection. Thats why cavitation is bad as it can rip off the layer and now its an issue as to how long before the layer is back again to prevent corrosion.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2001 Jeep Grand Cherokee Laredo 4.0- sold
1999 Dodge Ram 2500 w/Cummins- 4-sale


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#3202936 - 12/01/13 01:51 PM Re: Changing Dexcool Too Soon? [Re: yonyon]
ls1mike Offline


Registered: 06/14/08
Posts: 4226
Loc: In the Garage...
Originally Posted By: yonyon
Are you sure? I thought all Northstars had a dry intake.


I read Olds Alero! DOH!
_________________________
Mike
00 Trans Am 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#3202953 - 12/01/13 02:12 PM Re: Changing Dexcool Too Soon? [Re: ls1mike]
Aurora09 Offline


Registered: 12/31/11
Posts: 69
Loc: Saint Clair, MI USA
A couple things; yes maybe I'll let it go until I find some rebates on dexcool. Also, the radiator and cap was changed summer 2011 along with new coolant which was about 30,000 miles ago. I have seen some write ups on the oldsmobile forums about "flushing" the cooling system using one of those kits that splice into the heater hose. I'm leery of that because my hose water is well water which isn't very good, and someone suggested using prestone super flush or some such thing, but I understand from my mechanic that this stuff is particularly corrosive. All I really want to do is drain it, refill with Kinetico filtered or distilled water and cycle that thru a few times, drain and refill(s) until it is clear. The thermostat seems fine, so that would be a job to do if I eventually need to replace the water pump. Does anyone here bother with the "flush kit" or "radiator super flush" or any of that?
_________________________
1994 Jeep Grand Cherokee Laredo. 4.0 six cylinder. 266,000 miles. Fram orange filter, service pro 10W30 oil.

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#3202961 - 12/01/13 02:19 PM Re: Changing Dexcool Too Soon? [Re: Aurora09]
ls1mike Offline


Registered: 06/14/08
Posts: 4226
Loc: In the Garage...
I don't use the super flush. I have in the past used the "Flush Kit", but I had a clogged heat corp.

I just do a drain and fill on my wet intake cars.

You are fine for a bit.
_________________________
Mike
00 Trans Am 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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