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Premixed Blue Coolant #4510504
09/07/17 11:31 PM
09/07/17 11:31 PM
Joined: Mar 2005
Posts: 63
Boulder, Colorado
boulderdentist Offline OP
boulderdentist  Offline OP
Joined: Mar 2005
Posts: 63
Boulder, Colorado
I have a 2010 Subaru Outback which takes Subaru blue long life coolant. Pep Boys has a gallon undiluted for about $15.00. On a Subaru forum was advised to use the premixed long life blue because it has deionized water, not distilled. Apparently deionized water is not easy nor economical to purchase. Does anyone have opinions on the superiority of deionized water vs distilled? Frankly I have used tap water for most of the last 35 years with no apparent problem. I have read city water reports and fail to understand how a few parts per million can affect cooling system??? In the last year or two have switched to distilled water for rinses and flushes because of low cost. Is deionized water worth the extra expense of a pre-diluted blue coolant?

Scott

Re: Premixed Blue Coolant [Re: boulderdentist] #4510511
09/07/17 11:52 PM
09/07/17 11:52 PM
Joined: Aug 2008
Posts: 3,170
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,170
USA
I don't believe that whoever supplies Subaru's coolant is actually using lab grade DI water.

Re: Premixed Blue Coolant [Re: boulderdentist] #4510515
09/08/17 12:16 AM
09/08/17 12:16 AM
Joined: Feb 2007
Posts: 78
Maryland
chemman Offline
chemman  Offline
Joined: Feb 2007
Posts: 78
Maryland
For use in diluting antifreeze, there really is no significant difference between distilled water and deionized water.

The difference between distilled and deionized water is in the process used to get to the final product. Distilled water begins as regular water and is heated to it's boiling point, and the vapors are collected (condensed) when the vapors hit a condenser filled with cold water. Deionized water starts off with regular water also, but it usually is "forced" through a membrane to purify it. In both cases the various dissolved minerals, salts, and other microscopic matter originally in the water is left behind.

I use distilled water from Walmart since it sells for about $0.88/gallon whenever I need distilled/deionized water.


92 Olds 88 Hav 5w30 PL/L24011
99 Buick Century Hav 5w30 PL/L24011
99 Silverado 5.3L Hav 5w30 PL/L25288
04 TrailBlazer 4.2L Hav 5w30 PL/L25288
Re: Premixed Blue Coolant [Re: boulderdentist] #4510568
09/08/17 06:01 AM
09/08/17 06:01 AM
Joined: Sep 2008
Posts: 1,966
Pennsylvania
Boomer Offline
Boomer  Offline
Joined: Sep 2008
Posts: 1,966
Pennsylvania
I note that my wife's German iron requires the use of deionized water. Use of distilled water will void the warranty. [censored]??? As a chemist, I can't see what the difference would be unless the deionization process is poor and leaves residual ionic material behind in which case it would cause unwelcome deposits.


2013 VW Passat TDI SE, 59,300 miles Castrol Professional VW507 5W-30
2017 VW Golf All Track 17,470 miles Castrol Professional VW505 5W-40
Re: Premixed Blue Coolant [Re: boulderdentist] #4510588
09/08/17 06:39 AM
09/08/17 06:39 AM
Joined: Mar 2010
Posts: 96
Everywhere
AndyinAL Offline
AndyinAL  Offline
Joined: Mar 2010
Posts: 96
Everywhere
http://www.hyperlube.com/c3/super-coolant-c8.html

I have always used distilled water but I came across this last month and it has me wondering. There is a link in the product description linking to a note about not using distilled water.

Last edited by AndyinAL; 09/08/17 06:40 AM.
Re: Premixed Blue Coolant [Re: boulderdentist] #4510607
09/08/17 07:20 AM
09/08/17 07:20 AM
Joined: Oct 2008
Posts: 12,471
The Old North State
Sayjac Offline
Sayjac  Offline
Joined: Oct 2008
Posts: 12,471
The Old North State
Originally Posted By: boulderdentist
... Is deionized water worth the extra expense of a pre-diluted blue coolant

No. Get the PB OEM concentrate and use distilled water with it, it will work fine.

DI vs distilled water has been discussed on this sub forum before. IMO, the answer linked sums it up best... https://bobistheoilguy.com/forums/ubbthr.....W#Post2474198

As for the vehicle specific forum, typical in my observation of advice coming off those type forums.

Re: Premixed Blue Coolant [Re: AndyinAL] #4510638
09/08/17 08:03 AM
09/08/17 08:03 AM
Joined: Dec 2005
Posts: 9,905
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 9,905
Upper Midwest
Originally Posted By: AndyinAL
http://www.hyperlube.com/c3/super-coolant-c8.html

I have always used distilled water but I came across this last month and it has me wondering. There is a link in the product description linking to a note about not using distilled water.

That article is full of inaccuracies and gets linked here from time to time. Here is a thread and a post I made a year ago on the subject:

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4113105/Re:_Ph_balance_of_coolant?#Post4113105


1994 BMW 530i, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
Re: Premixed Blue Coolant [Re: Boomer] #4510643
09/08/17 08:09 AM
09/08/17 08:09 AM
Joined: Dec 2005
Posts: 9,905
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 9,905
Upper Midwest
Originally Posted By: Boomer
I note that my wife's German iron requires the use of deionized water. Use of distilled water will void the warranty. [censored]??? As a chemist, I can't see what the difference would be unless the deionization process is poor and leaves residual ionic material behind in which case it would cause unwelcome deposits.

Can you post the exact language from your owner's manual (or wherever you saw it) regarding the water and warranty coverage?


1994 BMW 530i, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
Re: Premixed Blue Coolant [Re: Reddy45] #4510646
09/08/17 08:13 AM
09/08/17 08:13 AM
Joined: Dec 2005
Posts: 9,905
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 9,905
Upper Midwest
Originally Posted By: Reddy45
I don't believe that whoever supplies Subaru's coolant is actually using lab grade DI water.

Really? How would you know?


1994 BMW 530i, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
Re: Premixed Blue Coolant [Re: boulderdentist] #4510659
09/08/17 08:27 AM
09/08/17 08:27 AM
Joined: Apr 2009
Posts: 222
Reno, Nevada
Langanobob Offline
Langanobob  Offline
Joined: Apr 2009
Posts: 222
Reno, Nevada
Don't have an opinion on water but I suggest using the Subaru cooling system sealant sold at the dealerships. Unbelievable that they haven't been able to resolve their head gasket problems after what, 30 or more years? My wife's 2010 Forester started losimg coolant at 120,000 miles.

Last edited by Langanobob; 09/08/17 08:29 AM.

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