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Old 05-12-2019, 10:58 PM   #1
Awdthony
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Member#: 494783
Join Date: Dec 2018
Location: Florida
Vehicle:
2006 WRX STI
World Rally Blue

Default Built Engine Coolant

So i currently have a built 2006 WRX STI IAG Short Block, CNC Ported & Brian Crower Internals for the Heads with Cosworth Gaskets in a 705 Casting with a Rotated 6466, etc.

Since its a 2006 STI i would typically use the green coolant but since im running a 705 casting and new lines can i run SuperBlue? Its a super niche question but im not quite sure. I have a Mishimoto Dual Core Radiator (Not X Line) if that matters?
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Old 05-12-2019, 11:07 PM   #2
Blktrax
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Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: West, NC
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2002 WRX 223K Mi.

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SuperBlue is 100% backwards compatible with Subaru green. However the coolant still should be serviced every 30k miles as the green was supposed to be.

Advantage is SuperBlue already premixed 50/50 with distilled water and corrosion inhibitors. Where as Subaru green is 100% Coolant and you have to make your mix with distilled water. Plus recommended adding a bottle of Subaru coolant conditioner.

Using tap water just introduces all the fun chlorine and other minerals the make corrosion and deposits form in the cooling system.
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Old 05-14-2019, 01:03 PM   #3
Awdthony
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World Rally Blue

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Quote:
Originally Posted by Blktrax View Post
SuperBlue is 100% backwards compatible with Subaru green. However the coolant still should be serviced every 30k miles as the green was supposed to be.



Advantage is SuperBlue already premixed 50/50 with distilled water and corrosion inhibitors. Where as Subaru green is 100% Coolant and you have to make your mix with distilled water. Plus recommended adding a bottle of Subaru coolant conditioner.



Using tap water just introduces all the fun chlorine and other minerals the make corrosion and deposits form in the cooling system.


When you say add Subaru Conditioner, is that to the blue or green?
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Old 05-14-2019, 02:25 PM   #4
gabo_s13
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WRB

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Quote:
Originally Posted by Awdthony View Post
When you say add Subaru Conditioner, is that to the blue or green?
When I went to the dealership to buy me some of the blue stuff, they told me there was no need to run the conditioner on it.
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Old 05-14-2019, 03:58 PM   #5
rtv900
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Quote:
Originally Posted by Awdthony View Post

since im running a 705 casting and new lines can i run SuperBlue?
What is a 705 casting?

you mean aluminum?
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Old 05-14-2019, 05:42 PM   #6
Waddlz
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SWP

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you can get Subaru blue coolant at Walmart/O'reillys for half the price of the dealership. its Zerex by Valvoline and is $14 a gallon.
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Old 05-14-2019, 06:10 PM   #7
Blktrax
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Quote:
Originally Posted by Awdthony View Post
When you say add Subaru Conditioner, is that to the blue or green?
Both, doesn’t matter. I’ve run blue in both my ‘02 wrx’s, One of witch for the last 5 years. Just changed it again and did the t-belt last month. Add one bottle.

Quote:
Originally Posted by gabo_s13 View Post
When I went to the dealership to buy me some of the blue stuff, they told me there was no need to run the conditioner on it.
Your mileage may vary. I run it in absolutely every Subaru I own, and whenever the coolant is serviced.
Period.


http://www.scoobyenthusiast.com/subaru-maintenance/all-about-subaru-cooling-system-conditioner-soa635071.html


Last edited by Blktrax; 05-14-2019 at 06:16 PM.
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Old 05-15-2019, 03:44 PM   #8
Scuby04STi
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Rally Blue

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Quote:
Originally Posted by rtv900 View Post
What is a 705 casting?

you mean aluminum?
The case halves all use a casing # to identify them, one of the options for a 2.5 is a #705 case.

I haven't run anti-freeze for years in mine, never understood the whole "only use XXX in your Subaru" stuff. LOL
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Old 05-15-2019, 05:02 PM   #9
Delphi
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Quote:
Originally Posted by Scuby04STi View Post
I haven't run anti-freeze for years in mine, never understood the whole "only use XXX in your Subaru" stuff. LOL
Running generic green in all my cars. Never had one issue
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Old 05-15-2019, 05:22 PM   #10
Scuby04STi
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Rally Blue

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Quote:
Originally Posted by Delphi View Post
Running generic green in all my cars. Never had one issue
I just run water in anything that touches a track. I will never be "that guy", lol.
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Old 05-17-2019, 12:00 PM   #11
subaru_gc8
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silver

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Quote:
Originally Posted by Scuby04STi View Post
I just run water in anything that touches a track. I will never be "that guy", lol.
do you drain it cause water causes lots of corrosion
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Old 05-17-2019, 12:35 PM   #12
Jedi03
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Blue

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any should work as long as its maintained/flushed on a proper basis, basically when the glycol starts to get to acidic. i have done all types and will be switching when i need...splurged for Subaru oe coolant when doing my first flush, arm an a leg in cost just about lol. i personally use tap water with undiluted antifreeze, haven't had any issues on any of my vehicles...
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Old 05-17-2019, 01:28 PM   #13
Scuby04STi
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Rally Blue

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Quote:
Originally Posted by subaru_gc8 View Post
do you drain it cause water causes lots of corrosion
Not really, I guess every few years.

I disagree, I have spent my whole life around marine application engines that use RIVER WATER to cool themselves. As long as its not terribly acidic its fine. I have run water in my car for 40k or so, and in at least a half dozen track only cars. NEVER had a corrosion related issue.
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