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2004 2.0 X
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440 Posts
Discussion Starter · #1 ·
On google I find alot of people 'anti' conditioner/Radweld etc as it clogs up the coolant system?

Are there are pro folks on here who have used Radweld etc? I wouldnt use the whole bottle to be honest. Probably about 1/4 of a bottle.
 

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The Modfather
2019 Impreza 5dr Sport - Manual
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8,075 Posts
Subaru requires it in the states at coolant changes so I suppose it can't be that bad.

http://www.scoobymods.com/wwp_99_phase_ii-t2993.html?t=2993

I mean if they are using like they are supposed to, then lots of scoobies have it in the system. I don't know I've heard of a ton of issues. I agree I don't like putting "stuff" in the coolant but they must have done some sort of testing to require using it.
 

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2016 Outback and WRX CVT
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2,551 Posts
Like Peaty said, ALL of the "by Hoyle" Subaru literature here in the US insist that the Subaru Coolant Conditioner is a requirement.

But I know that in the enthusiast/hobbyist circles, its use is indeed still much debated.

Like I said here:

Coolant Change - Page 11 - Subaru Legacy Forums

I'm OK if an individual end-user doesn't use it, due to his/her personal beliefs and/or experience.

I'm OK if a dealership either recommends it, based on Subaru's official lines, or, alternatively, if they tell you of that, and then recommend that you not, but then say that it's specifically based on their experience, and that it's their professional or personal opinion that you do not.

There's good reasoning, either way.
 

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2000 2 Outbacks 1Man , 1 Auto
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312 Posts
For "Conditioner" substitute the words "Leak Stopper" . Have a good bit of experience of using 'BARS LEAKS' , and similar to 'RADWELD' , in the past on older cars and could last for years . A great coolant system additive for stopping minor leaks in capillary tubes in radiators but would never stop a major leak at a busted weld for example or big cracks. The construction of radiators nowadays seems flimsy compared to days gone by and this I think is where Subaru are coming from. The major parts of the radiator shouldn't fail but the flimsy capillaries and fins don't give them the same confidence!. As I say it wont stop a major leak and so will never be a factor in clogging the system so rest easy.
 

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Registered
2004 2.0 X
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440 Posts
Discussion Starter · #6 ·
For "Conditioner" substitute the words "Leak Stopper" . Have a good bit of experience of using 'BARS LEAKS' , and similar to 'RADWELD' , in the past on older cars and could last for years . A great coolant system additive for stopping minor leaks in capillary tubes in radiators but would never stop a major leak at a busted weld for example or big cracks. The construction of radiators nowadays seems flimsy compared to days gone by and this I think is where Subaru are coming from. The major parts of the radiator shouldn't fail but the flimsy capillaries and fins don't give them the same confidence!. As I say it wont stop a major leak and so will never be a factor in clogging the system so rest easy.
When I had my cambelt changed the radiator/coolant hose blew off as it wasnt tightened up (emptying the contents of the radiator allover) and the pully bolts squealed as they also weren't torqued. So its a fair guess that maybe the radiator was 'nicked when placed on the floor or removed/refitted. Before the cambelt change the coolant level was fine.
 

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02 Forester L (sold) Manual
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1,220 Posts

Not Subaru-specific, but I've used this stuff for years with good results at stopping small weeping annoyances such as freeze plugs and radiator seals. It may not be as useful in attempting head gasket leaks because it needs oxygen to activate it, but it definately does not clog anything.
 

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2002 Forester S
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269 Posts
The local WRX/STI racers told me NOT to use the Subie conditioner, as did a local independent Subie specialist mechanic. Both said it clogs things up, and is basically there as a band-aid for the head gasket issues.

You know, there are some pellets that GM tells you to drop in the radiator when you do a flush and refill on one of their cars, I wonder whatever that is would work here?
 

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Premium Member
2015 Highlander AWD XLE 6AT
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4,255 Posts
Question- the non-turbo coolant system. How many litre's is it?
Hora,

The coolant capacity for my '09 U.S. spec Forester with the 2.5 N/A (non-turbo) engine and manual transmission is 7.2 U.S. qt. / 6.8 litres / 6.0 Imp. qt. (ref Owner Manual pg. 12-4).

The non-turbo with the AT is 7.1 / 6.7 / 5.9, and the turbo w/ AT is 8.5 / 8.0 / 7.0, all respectively.

I don't know if this correlates to your 2004 with the 2.0 engine.

HTH,
Jim / crewzer
 

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2008 LL Bean (4EAT)
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5,150 Posts
The local WRX/STI racers told me NOT to use the Subie conditioner, as did a local independent Subie specialist mechanic. Both said it clogs things up... there are some pellets that GM tells you to drop in the radiator when you do a flush and refill on one of their cars...
"... Whenever the coolant is changed, you must add Genuine Subaru Cooling System Conditioner, (P/N SOA635071). It’s been tested and approved for Subaru aluminum engines and radiators. Do not use aftermarket coolant reinforcement agents, sealers and/or flushing agents as those chemicals could corrode aluminum parts, or cause clogging..."
http://endwrench.com/images/pdfs/CriticalCooling.pdf
Some would go with go with the racers, mechanics and pellets.
 

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2016 Outback and WRX CVT
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2,551 Posts
^ If by citing the above-mentioned "by-Hoyle" Subaru-literature, that such a recommendation is inherently superior then what we have as "community knowledge and know-how, I find that hard logic to follow.

There have been, time-and-again, errors in the Subaru "official" literature, as well as ill-conceived/executed products - for which we as a community have only come to realize specifically due to the knowledge and experiences of our fellow enthusiasts and hobbyists - the "racers, mechanics, and pellets."

This is why I don't particularly take exception to those who refuse to use the Conditioner in their vehicle - as long as they can provide good reason (and to-note, there now have been people who've torn-down their blocks and undertaken drastic re-builds of their late-generation Subarus, after many tens of thousands of miles and years WITHOUT the use of the Conditioner, that notice no issues, upon detailed examination, with either their cooling system or headgasket).

To me, until we've got more hard-data, it's a toss-up, particularly given the sheer number of highly-experienced Subaru professionals as well as enthusiasts/hobbyists that recommend specifically against the use of this product.


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My car is a non-turbo car with lower-strain/etc and a potential radiator leak. The 2.5 Legacy's in the States are also non-turbo? (I am guessing on the second bit).
^ It depends on the model - we've got both turbo and non-turbo 2.5L variants, in the Legacy platform for both of the latest two generations.

Subaru's official statements, again, recommends the use of their Conditioner product for *ALL* Subaru vehicles, including the turbocharged variants.

Me, personally? Yes, I use the Conditioner in my '05 Legacy 2.5GT, which is, indeed, turbocharged.
 
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