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Old 07-27-2020, 03:29 PM   #1
Ehrek
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Default Coolant Question

I have a 2003 wrx(2.0 Turbo) and i wanted to do a coolant flush and ive noticed that the previous owner had green coolant(recently bought the car) and i wanted to use the oem subaru super coolant but would i be able to use it for my year, and would I have to use the super coolant or just the long life coolant ? any help is appreciated
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Old 07-27-2020, 05:08 PM   #2
Samurai Jack
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I used Prestone since 2002 w/zero issues.
- Allegedly it can cause issues over time but I did change the original OEM radiator after 14 years.

You can also use the Subaru blue coolant.
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Old 07-28-2020, 09:32 AM   #3
Unabomber
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You can use it but you have to do it one of two ways:

1. FLUSH your block. As in drain, stick a hose in the turbo tank for 5 minutes, then repeat in the radiator.
2. Flush via machine, dealers have the machine with the right coolant.

In the end, it won't matter though as your cooling capacity is the same with Dollar Store or LEGION Coolant and you'll probably sell the care before your next change. You do you though.
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Old 07-28-2020, 09:55 AM   #4
Jack
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What I would do, because I'm lazy.... Drain the coolant. Save it and put it in a tray under my roll away in the garage because mice will be attracted to it, and either take a sip and die or fall in and die.

Now, I'll fill the cooling system with distilled water. I'll run it this way until Labor Day. On Labor day, I'll drain out that water and fill with subaru coolant and distilled water 50/50, add a bottle of subaru conditioner (aka, stop leak).
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Old 07-28-2020, 10:55 AM   #5
WhiteZombie
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Quote:
Originally Posted by Jack View Post
What I would do, because I'm lazy.... Drain the coolant. Save it and put it in a tray under my roll away in the garage because mice will be attracted to it, and either take a sip and die or fall in and die.

Now, I'll fill the cooling system with distilled water. I'll run it this way until Labor Day. On Labor day, I'll drain out that water and fill with subaru coolant and distilled water 50/50, add a bottle of subaru conditioner (aka, stop leak).
Not a bad idea for a thorough flush, but isn't lack of lubricity in plain water bad for the water pump seals, long term?
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Old 07-28-2020, 11:29 AM   #6
Jack
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Quote:
Originally Posted by WhiteZombie View Post
Not a bad idea for a thorough flush, but isn't lack of lubricity in plain water bad for the water pump seals, long term?
Add water wetter.
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Old 07-28-2020, 12:09 PM   #7
wooshwoosh
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Assuming that you manage to flush / dilute out any of the old coolant sufficiently (5 or 7 rinse cycles should do), you should be able to use whatever you wish.

Note however that the current subaru oem coolant (blue stuff) is a HOAT coolant, which is drastically different to the old oem green coolant. The original OEM green coolant was an inorganic type coolant, with phosphates and no silicates, but as the EU ban on phosphates and other silly environmental nonsense sprung up overnight, it got phased out in favor for OAT's and HOAT's which lack a fast acting layer of protection for your aluminium engine.

Also note that the color of the previous coolant (green) has no bearing on what type of coolant it was ; the colors are just general conventions - green for inorganic, blue/red for OAT, yellow for HOAT ; there are green coolants that are OAT's just as there are inorganics.

Personally, I am not a fan of OAT's or HOAT's as it seems to have caused a great deal of pitting and corrosion along with other headaches. Instead I opted for a low silicate inorganic, with water wetter built in.
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Old 07-29-2020, 09:24 AM   #8
WhiteZombie
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Quote:
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Add water wetter.
Now we're talkin!
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Old Yesterday, 11:58 AM   #9
Hoodlumz
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Quote:
Originally Posted by Ehrek View Post
I have a 2003 wrx(2.0 Turbo) and i wanted to do a coolant flush and ive noticed that the previous owner had green coolant(recently bought the car) and i wanted to use the oem subaru super coolant but would i be able to use it for my year, and would I have to use the super coolant or just the long life coolant ? any help is appreciated


Is there a reason you want to switch to the super coolant? You do realize the green long life coolant is OEM also, right?

You canít mix the two but if you do a full flush then youíll be fine.
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Old Yesterday, 09:11 PM   #10
Ehrek
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Quote:
Originally Posted by Hoodlumz View Post
Is there a reason you want to switch to the super coolant? You do realize the green long life coolant is OEM also, right?

You canít mix the two but if you do a full flush then youíll be fine.
Because i bought the car recently I was going to do a complete coolant flush because i dont know if it actually is oem or another brand and i might've phrased my question wrong but i was just wondering what type of coolant i should use but i found out that the green long life is the best choice for my car rather than the super coolant which ive heard is for 2008 and beyond
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