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2010 Forester XT
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Discussion Starter #1
For the owners of the MY 2009-2010 Subaru Foresters: Have any of you checked the coolant on your Forester? Is it blue or green? I skimmed through the manual and it say's only use "Subaru Super Coolant" and not to mix anything other coolant. I asked the local Subaru dealer if the coolant they are selling is blue or green and they said green but it does matter and I can mix what they have. Should I still purchase it? I'm a little hesitant because my 2007 WRX uses the green coolant which Subaru calls it the "Subaru Long Life Coolant" I just don't want to mix something in there that might potentially be bad for the radiator. Your thoughts would be very helpful. Thanks in advance.
 

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2015 Highlander AWD XLE 6AT
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4,255 Posts
Subaru's new Long Life Super Coolant is blue. The attached End Wrench article indicates it's OK to mix the two; see the last page.

HTH,
Jim / crewzer
 

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2016 Outback and WRX CVT
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Like the others have said, yes, it's OK to mix the two Subaru coolants, but you should know that mixing the new blue "Super" coolant with the older green one will drop the service-life of your coolant down to that of the green. Thus, if at all possible, use the blue.

Your local Subaru dealer should easily have access to the new coolant - as a matter of fact, I would truly wonder why they do not have the new coolant, given vehicles of more recent manufacture have all been switched to the "Super" coolant, regardless of recommended service intervals for the cooling system.

http://www.subaruforester.org/vbulletin/f88/coolant-conditioner-not-required-my-05-a-54698/

http://www.subaruforester.org/vbull...ka-subaru-coolant-conditioner-thoughts-65712/

Those two threads, along with the referenced Subaru articles above, should provide you with further interesting reading. :smile:
 

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2004 Forester XT Premium 4EAT
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29,450 Posts
I've heard numerous times that the two coolant types should not be mixed. Subaru seemed confused about the issue at first and mentioned that mixing is ok, but later changed their statement, IIRC.

Here's what AWD Auto (Subaru Specialists in WA) have to say on the subject: The New Subaru Super Coolant Used In The Service And Repair Of Your New Subaru. - Seattle Subaru Repair

The New Subaru Super Coolant Used In The Service And Repair Of Your New Subaru.

February 21st, 2008 by Justin Stobb

The new 2008 Subaru WRX STI and all of the 2009 model year Subaru’s use a new type of coolant dubbed by Subaru as “Subaru Super Coolant”. This coolant is blue in color and every bottle has a big “S” in the middle and a red cape on it.

According to Subaru the new Coolant must NOT be mixed with any other type of coolant. This means that when the cooling system is serviced for any reason or the overflow bottle is topped off during a routine oil change the new coolant must be used.

Subaru is stating that the mixing of the new coolant with any other type of coolant will alter the protection capabilities of the new coolant, which Subaru claims will last 10 years before service is needed.

The good and bad explained.

By increasing the service life of engine coolant we should be able to cut down on some of the hazardous waste generated when performing routine maintenance. This should also save some money with regards to the cost of service, and has the added benefit of being better for the environment.

The new Super coolant is much more expensive than just regular coolant or even the Factory Subaru coolant used to date. Also is the real possibility that not every shop, (especially quick lube centers) will follow the recommendation of the manufacturer.

This can and will create a situation where the owner of a newer Subaru will wait the 10 years for service, but because the coolant is mixed may be faced with expensive repairs prior to that service being done. This is where a good Independent Subaru Repair shop like All-Wheel Drive Auto can serve you better.

Staying informed is the only real way to get the most out of your vehicle.
 

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Resident Ninja
2011 2.5X Premium Auto
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When my head gasket went a while ago I asked the mechanic about the Super Coolant. They put it in and said there aren't any issues with using it, you just should not expect it to last the 10 years due to the remnants of the previous coolant.
 

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2016 Outback and WRX CVT
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^ Exactly. :smile:


----


I've heard numerous times that the two coolant types should not be mixed. Subaru seemed confused about the issue at first and mentioned that mixing is ok, but later changed their statement, IIRC.

Here's what AWD Auto (Subaru Specialists in WA) have to say on the subject: The New Subaru Super Coolant Used In The Service And Repair Of Your New Subaru. - Seattle Subaru Repair
^ I think that's a really well-thought-out response, and I definitely agree.

I just wish that dealership techs were better informed! :icon_sad:
 

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Yup you can mix them, but any green coolant in the system and you have to follow the shorter change interval.

The local dealer wont mix, and won't put the blue into a car that has been using the green, mostly due to the higher cost with no added benefit if switching to the blue.
 

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2016 Outback and WRX CVT
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The "by-Hoyle" is to use the additive.

However, within the community, there's debate as to whether to use the additive, at all.

All I'm willing to say at this point, as a personal recommendation, is that you should read-up on both sides of the argument for and against the additive, and then make your own educated decision. :smile:
 

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2009 Forester XT Limited
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They will have a hard time convincing me that any fluid other than water is still good after ten years but I am stubborn and old school.

Did they test this Super Coolant in a time machine to know it lasts ten years or what?
 

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2016 Outback and WRX CVT
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^ :lol:

I know precisely what you mean - much of my automotive world-view was also "beaten in" by my old old-school teachers: my OCI is a religious 3K-miles or 3-months, whichever first. It's hard to break an old dog of his old ways.
 

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2010 Forester 2.5XPremium Automatic
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so if i wanted to buy subaru brand super coolant, where would I be able to get it online? any and all help much appreciated...
 

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2016 Forester XT Touring
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943 Posts
If you are willing to spend the $25 to $40 for that, why not just pick up the OEM coolant from dealership for $30? (less with a coupon).
 

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2015 Subaru Forester Auto
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275 Posts
I have no reason not the buy the OEM other wise...:)
 

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2010 Forester Ltd 4EAT
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I WISH that I read this page (or read the damn manual) before topping off my coolant.

I just bought a 2010 Forester with 50K miles on it. I noticed the coolant reservoir was low so I topped it off with my leftover green Long Life coolant from my 05 Legacy.

I must have only topped it off with at most 1/2-quart of the green coolant. Does this mean I just "screwed" the blue super Long Life cooland on my system?

If so, at 50K miles, when should I replace the coolant? Can I instead replace it completely with the new green Long Life coolant + conditioner? I still have 1 gallon of un-opened green Long Life coolant. When mixed with 1 gallon of distilled water, it's perfect for 1 coolant change, as opposed to having to buy 2 gallon of expensive blue super Long Life coolant.

Thanks!
 

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2016 Forester XT Touring
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Welcome to the site.
From my understanding, since you have mixed in the green, you have already "contaminated" the system. Now I don't see that isn't as negative as it could seem to think you are "screwed", you just can't take the coolant interchanges out to 100k, like you could with the blue. They can be mixed with no problems.
Even if you drained and refilled with blue, you would still have to do the lower mileage change of the green.
Personally, I think I would prefer the lower mileage change, as I live in a congested area and spend a lot of time in bumper to bumper.
 
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