Welcome to the North American Subaru Impreza Owners Club Sunday April 20, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-30-2007, 12:28 PM   #1
dmarcel
Scooby Newbie
 
Member#: 59377
Join Date: Apr 2004
Location: Baton Rouge, LA
Vehicle:
1997 Impreza
Pearl Blue

Default Dex-Cool vs. Subaru Coolant questions

A few questions about DexCool and Subaru coolant.

I've been running DexCool on my 97 Impreza from miles 127000 to present at 185000. I've been changing it every 30k, which is always less than two years for the amount of driving I do. When I added it there was some sort of green coolant in it. I flushed the system out completely (about 5 times) with distilled water when I switched.

I've never had any problems with the engine (its been running on 5w30 Mobil 1 since 127000).

But having read about the use of Dex Cool on this board, I'm wondering. If I should switch to the Subaru Coolant. I'm confused on a few points, though, people on this board are saying that DexCool works in aluminum engines bc it is phosphate free, yet the literature from Subaru on the issue states their anti-freeze contains "non-amine" Phosphates. Is this a misconception, or are non-amine phosphates different from ordinary phosphates?

I just changed the coolant, too. Is the risk so high that it would be worth it to flush and refill with Subaru antifreeze? I'd hate to do that, considering both the cost and the waste of disposing of perfectly good toxic fluids. Should I switch next time I change the coolant? Should I just keep using the same stuff, since it seems to work fine (I've noticed no evidence of oil or fuel in the coolant when I change it)? After having used the DexCool for so long, is there a risk associated with changing coolants? (deposites built up by the DexCool reacting with stuff in the Subaru antifreeze, for instance)


I foollow Subaru's recommendations insofar as what I put into my car and when I service my car, etc. - because afterall, they made the thing. But when it comes to making me buy antifreeze from only them, I tend to have a natural distrust of that because they have a financial incentive to do it.

Has anyone who a) properly flushing all the old fluid out of the system and switching to DexCool and b) changed their coolant ever 30,000 miles or 2 years, had any problems that could be attributed to the coolant?

Oh, and also, I always use the distilled water when I flush and mix the coolant. The water here is extremely soft so its probably fine, but distilled water is so cheap.
* Registered users of the site do not see these ads.
dmarcel is offline   Reply With Quote
Old 01-30-2007, 03:25 PM   #2
crampfan
Scooby Specialist
 
Member#: 74321
Join Date: Nov 2004
Chapter/Region: MWSOC
Location: clarksville AR
Vehicle:
2004 wrx wag
black UTEC stg 4

Default

We do not even use dex-cool in GM cars, the green is fine, dex-cool has been known to (WILL) break down and cause all kinds of issues with plugging the heater core and radiator I think that most GM mechanics will not install dex-cool anymore. The stuff works about as good as GM side post batterys. just use the good old green.
crampfan is offline   Reply With Quote
Old 01-31-2007, 01:40 PM   #3
Annapolis Subaru
NASIOC Vendor
 
Member#: 107051
Join Date: Feb 2006
Chapter/Region: MAIC
Location: Annapolis, MD
Default

Subaru recommends that you use their brand of coolant because it contains anti-corrosive agents and is specially formulated for Subaru radiators. I would not suggest that you use Dex-Cool for Subaru vehicles. At the very least, stick with the green stuff.

Jackie
Annapolis Subaru
443-837-1422
Annapolis Subaru is offline   Reply With Quote
Old 02-01-2007, 07:56 PM   #4
NWstiLTD
Scooby Newbie
 
Member#: 133458
Join Date: Nov 2006
Chapter/Region: NWIC
Location: Oregon
Vehicle:
2007 WRX STI Limited
"urban gray metallic"

Default

I want to back up crampfan on that one. Worked at a GM store for 10 yrs. Dexcool is the devil It will destroy, corrode, block, clog etc. I have seen it pack the bottom half of a 4.3 block full of rust so bad we had to pull the freeze plugs to fix
NWstiLTD is offline   Reply With Quote
Old 02-02-2007, 03:37 PM   #5
Aaron'z 2.5RS
Scooby Guru
 
Member#: 1026
Join Date: Mar 2000
Chapter/Region: MWSOC
Location: Hickigan
Vehicle:
'00 RS/WRX Stg5
'98 RS Stock

Default

I'm with everyone else, i just did a timeing belt and water pump.... i was super stressed over the coolant, i bought a bunch of peak global and i had a mechanic friend help me.... i told him about my conserns and he said,TAKE THAT CRAP BACK, screw the pink (or orange) use the good old green... the other stuff is crap and clogs everything up.... You might have to change the green more often, but it's not going to eat everything up.... He's worked on everything for 10+ years... and wouldn't put Dex-cool in a Honda even....lol
Aaron'z 2.5RS is offline   Reply With Quote
Old 02-02-2007, 11:17 PM   #6
ivwarrior
Scooby Specialist
 
Member#: 100610
Join Date: Nov 2005
Location: Lewistown, PA
Vehicle:
2002 WRX
MBP

Default

There was a good reason we called it Dex-Sludge at the garage I used to work at. Just about every GM vehicle that came in had a pile of sludge in the over-flow tank. I wouldn't use it in anything, especially not a Subaru.
ivwarrior is offline   Reply With Quote
Old 02-03-2007, 08:40 AM   #7
DrD
Scooby Guru
 
Member#: 22412
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Albuquerque, NM
Vehicle:
2012 Legacy 2.5GT
Ice Silver Metallic

Default

Quote:
Originally Posted by Annapolis Subaru View Post
Subaru recommends that you use their brand of coolant because it contains anti-corrosive agents and is specially formulated for Subaru radiators.
All coolants contain corrosion inhibitors - the packages are, in many cases, quite similar (for the typical green colored ethylene glycol based coolants) - the materials are pretty much the same for all aluminum block/heads/radiator vehicles - there's nothing special about Subaru in that respect.
DrD is online now   Reply With Quote
Old 02-03-2007, 08:19 PM   #8
andrzejl
Scooby Newbie
 
Member#: 139643
Join Date: Feb 2007
Default

Quote:
Originally Posted by ivwarrior View Post
There was a good reason we called it Dex-Sludge at the garage I used to work at. Just about every GM vehicle that came in had a pile of sludge in the over-flow tank. I wouldn't use it in anything, especially not a Subaru.
another name I heard was Death-Cool (tm)
andrzejl is offline   Reply With Quote
Old 02-04-2007, 10:23 AM   #9
Maccgyver
Scooby Newbie
 
Member#: 137158
Join Date: Jan 2007
Chapter/Region: MWSOC
Location: Lake Zurich, IL
Vehicle:
2004 WRX wagon
PSM

Default

PRestone 50/50 pre-mixed is what I have used for awhile in all my cars and it has never let me down.
Maccgyver is offline   Reply With Quote
Old 02-04-2007, 11:03 AM   #10
IllNastyImpreza
Scooby Guru
 
Member#: 36333
Join Date: May 2003
Chapter/Region: NESIC
Location: East Kingston NH
Vehicle:
DIY project: life
I need more TIME!

Default

Last time I changed my coolant I just used water from the hose. Since then I have realized this is BAD ! good thing I am replacing my engine, and basicly get to start from scratch.

But I still have all that old coolant in my radiator. I'm thinking it might be cheaper to just buy a new racing radiator than to spend all that money on distilled water to flush out the old one :0)

what would u guys suggest? which coolant should I use ?
IllNastyImpreza is offline   Reply With Quote
Old 02-04-2007, 01:26 PM   #11
rick-l
Scooby Specialist
 
Member#: 33868
Join Date: Mar 2003
Location: Chesterfield, MO
Vehicle:
2003 wrx
srp

Default

I just got some legal looking papers in the mail saying I'm part of a class action lawsuit against GM saying Dex-cool dissolved the gaskets on the plastic intake and formed a mud like substance in the cooling system in a 3.8 litre engine.

I no longer own the vehicle but did experience these failures and spent alot of time (but not much money) fixing them. I doubt I'll get anything out of the lawsuit.

My only and last experience with Dex-cool.
rick-l is offline   Reply With Quote
Old 02-04-2007, 02:58 PM   #12
ivwarrior
Scooby Specialist
 
Member#: 100610
Join Date: Nov 2005
Location: Lewistown, PA
Vehicle:
2002 WRX
MBP

Default

Quote:
Originally Posted by rick-l View Post
I doubt I'll get anything out of the lawsuit.
The lawyers are the only ones who get anything out of class-action lawsuits.
ivwarrior is offline   Reply With Quote
Old 02-04-2007, 04:06 PM   #13
jay25RS
Scooby Specialist
 
Member#: 4273
Join Date: Feb 2001
Chapter/Region: NESIC
Location: CT
Vehicle:
2011 GR-STI
& 2014 Legacy Ltd.

Default

Quote:
Originally Posted by NWstiLTD View Post
I want to back up crampfan on that one. Worked at a GM store for 10 yrs. Dexcool is the devil It will destroy, corrode, block, clog etc. I have seen it pack the bottom half of a 4.3 block full of rust so bad we had to pull the freeze plugs to fix
Dexcool= evil. I was working on a Pontiac Bonneville (2002-2003) and inside of the overflow tank was horrible looking rust filled coolant with chunks in it like blue cheese dressing.
jay25RS is offline   Reply With Quote
Old 02-05-2007, 12:22 AM   #14
SEVENONEONE
Scooby Newbie
 
Member#: 111118
Join Date: Mar 2006
Chapter/Region: NESIC
Vehicle:
1986 Chevy chevette
small block 350

Default

You want real coolant run at 0 psi, no hot spots and virtually last forever? EVANS NPG+
http://www.evanscooling.com/html/npgPls.htm
SEVENONEONE is offline   Reply With Quote
Old 02-05-2007, 12:40 AM   #15
jason.g
Scooby Specialist
 
Member#: 88467
Join Date: Jun 2005
Chapter/Region: NESIC
Location: Super 88
Vehicle:
2005 WRX
All black everything.

Default

^^^
nice find...might have to give the Evans a shot when i do my coolant flush.

At my dealership we do not ever sell the Dexcool anymore...we've actually considered not stocking it but keep a case or 2 on hand just in case anyone actually has the nerve to request it. The only people that ever want it are usually our rookie lube techs...

FWIW I'm also running Prestone 50/50 green stuff.
jason.g is offline   Reply With Quote
Old 02-05-2007, 12:17 PM   #16
HighRevimpreza
Scooby Specialist
 
Member#: 90235
Join Date: Jun 2005
Chapter/Region: SCIC
Location: Valencia
Vehicle:
1993 GC ej255 swap
White

Default

when ever you go for the concentrated prestone please mix with distiled water.. Ive seen some people poor regular water into their cars =(...
HighRevimpreza is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Subaru coolant conditioner question RS Paul Service & Maintenance 18 04-24-2008 07:25 PM
Typical coolant usage and non Subaru coolant question pjensen641 Service & Maintenance 12 12-16-2003 12:23 AM
Dex-Cool Users Beware esteve Service & Maintenance 7 09-05-2003 12:18 PM
Advantage of Subaru coolant VS other brands? yamahito Service & Maintenance 8 02-15-2003 03:59 PM
Very cool Subaru vs. Subaru review Matt South East Region Forum 1 01-16-2003 01:46 PM


All times are GMT -4. The time now is 11:12 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.