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Old 12-29-2008, 05:13 AM   #1
H5N1
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Question Head Gasket Leak Problem on all NA 2.5?

I have owned 2 Impreza 2.5 RS. One is a MY98 and the other one is a MY99. Both cars have head gasket leak once roll over 100k (60k mile). My friend's MY02 TS also have the same problem. Does anyone know if Subaru have the problem fixed? I am planning to buy a newer NA Subaru but would like to know if this problem still exist in the newer engine.

Thanks in advance!!
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Last edited by H5N1; 12-30-2008 at 04:46 PM.
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Old 12-29-2008, 07:24 AM   #2
mdungelman
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Mine were leaking under 60k. Luckily replaced under warranty. I don't necessarily think its so common on the newer n/a's.
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Old 12-29-2008, 10:31 AM   #3
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I think they have finally started providing multi-layer HG gaskets for the NA 2.5L's to fix the common HG leaking problems. For older engines, they are the replacement part. I would guess that they come on newer engines from the factory - but I don't know what year that may have started.
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Old 12-29-2008, 11:03 PM   #4
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The dreaded HG leak on the newer motors is external, and not nearly as common as the DOHC EJ25D. So it just leaks out of the coolant passages, instead of into the combustion chamber. But the problem seems to have gone down with the newer style MLS gaskets.



~Josh~
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Old 12-30-2008, 07:03 AM   #5
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+1.

Most of the SOHC's tend to have them leaking externally where the DOHC's can leak and can be blown internally. I have only seen 1 SOHC engine blow headgaskets compared to several DOHC's.
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Old 12-30-2008, 01:09 PM   #6
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I'm half tempted to start a "Who hasn't had their HG's replaced?" thread. I still have my originals with about 182k miles on them and the engine sees a decent amount of abuse.
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Old 12-30-2008, 04:29 PM   #7
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my wife's 02 forester with 60k on it blew both headgaskets two weeks agao. my 03 OBS is currently in the shop with a blown driver side headgasket...feeling the urge to call SOA about it even though i doubt there will be any other conclusion than tough luck.
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Old 12-30-2008, 07:49 PM   #8
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So the newer motor doesn't have this problem anymore? Maybe Subaru has fixed it on the newer engine....
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Old 12-30-2008, 07:55 PM   #9
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I have seen very very few issues on the new ones.
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Old 12-30-2008, 10:03 PM   #10
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Quote:
Originally Posted by blackfang View Post
I have seen very very few issues on the new ones.
Do you mean newer, like 2006+? Please elaborate. A better question is, how many 2006+ cars do you regularly see in your shop with over 60K miles?

And what is the newest year/model that you have seen with a problem?
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Old 12-31-2008, 01:46 AM   #11
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The 2006+ is too new for the problem to surface. I guess the only way to tell is to wait for a few more years
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Old 12-31-2008, 02:08 AM   #12
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Quote:
Originally Posted by my4isflat View Post
I'm half tempted to start a "Who hasn't had their HG's replaced?" thread. I still have my originals with about 182k miles on them and the engine sees a decent amount of abuse.
me... 198k so far no HG problems.
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Old 12-31-2008, 08:49 AM   #13
blackfang
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Quote:
Originally Posted by surowrxa View Post
Do you mean newer, like 2006+? Please elaborate. A better question is, how many 2006+ cars do you regularly see in your shop with over 60K miles?

And what is the newest year/model that you have seen with a problem?
I am referring to 2005+. I would say about 25% of the 2006+ cars have 60-80k on them and roughly 40% of the 05's with that mileage.

I have seen 1 2005 Legacy wagon that had headgaskets leak coolant.
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Old 12-31-2008, 03:48 PM   #14
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Quote:
Originally Posted by my4isflat View Post
I'm half tempted to start a "Who hasn't had their HG's replaced?" thread. I still have my originals with about 182k miles on them and the engine sees a decent amount of abuse.
Tenative +1. My Forester has 125K and has never had them replaced, but I don't think we'll make it to 182K. EJ253, Phase II SOHC.

Do you use Subaru coolant conditioner?

Quote:
Originally Posted by blackfang View Post
I am referring to 2005+. I would say about 25% of the 2006+ cars have 60-80k on them and roughly 40% of the 05's with that mileage.

I have seen 1 2005 Legacy wagon that had headgaskets leak coolant.
Thanks for the answer. I was under the impression that Subaru beefed up the HG's somewhere around 2006 because of issues still surfacing up to MY2004.
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Old 12-31-2008, 06:35 PM   #15
Patrick L
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230K, 2000 2.5RS "knocks on wood" no HG problems. I am building a new motor thou with some slight modification allow in SCCA Solo SP class. Match weight factory .5mm OS pistons, .04 off the heads and block and balanced internals with a few other things.
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Old 12-31-2008, 07:35 PM   #16
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My '07 2.5i has had the headgaskets replaced already. I am only at 22,000 miles.
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Old 01-01-2009, 11:18 AM   #17
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Quote:
Originally Posted by westy4990 View Post
My '07 2.5i has had the headgaskets replaced already. I am only at 22,000 miles.
External leak I presume?

I guess that's why Subaru still wanted the newer models to use coolant conditioner even with the new style HG's.
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Old 01-01-2009, 01:37 PM   #18
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Quote:
Originally Posted by surowrxa View Post
External leak I presume?

I guess that's why Subaru still wanted the newer models to use coolant conditioner even with the new style HG's.
Yeah, it was external
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Old 01-01-2009, 03:06 PM   #19
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Quote:
Originally Posted by my4isflat View Post
I'm half tempted to start a "Who hasn't had their HG's replaced?" thread. I still have my originals with about 182k miles on them and the engine sees a decent amount of abuse.
Same, no replacement with me yet, hopefully never. What are the symptoms we see to know when to replace it? Im at 89k miles nothing been replace. Not headgasket not timing belt, but its running strong.
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Old 01-01-2009, 09:12 PM   #20
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Quote:
Originally Posted by SubieGenius View Post
Same, no replacement with me yet, hopefully never. What are the symptoms we see to know when to replace it? Im at 89k miles nothing been replace. Not headgasket not timing belt, but its running strong.
When the temp gauge hits H.

Not from personal experience, just reading alot, you will see coolant disappear. Possible smells of coolant hitting exhaust, bubbles in overflow after running. Heat may not blow hot.

Most important to keep a real close eye on your cold coolant level in your overflow. It'll save you some bucks.
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Old 01-02-2009, 07:41 PM   #21
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Quote:
Originally Posted by SubieGenius View Post
Same, no replacement with me yet, hopefully never. What are the symptoms we see to know when to replace it? Im at 89k miles nothing been replace. Not headgasket not timing belt, but its running strong.
Well, you're getting awfully close to the service interval on the timing belt. Best to not wait for it to go either. Interference engines don't like that.
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Old 01-03-2009, 04:04 AM   #22
H5N1
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Quote:
Originally Posted by westy4990 View Post
My '07 2.5i has had the headgaskets replaced already. I am only at 22,000 miles.
So even the MY07 has the problem.... and with such low milage?
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Old 01-03-2009, 07:49 AM   #23
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Quote:
Originally Posted by H5N1 View Post
So even the MY07 has the problem.... and with such low milage?
What you are not realizing is that all cars can have problems, but the amount of headgasket issues are far far less with the new models than the older ones.
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Old 01-03-2009, 05:24 PM   #24
Jerry Xu
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my 01 started leaking (internal) at 145K. I fixed it with the subaru coolant additive. I guess it wasn't bad enough.
Question is if we should use the additive (blue bottle) in the newer cars?
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Old 01-03-2009, 07:11 PM   #25
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Quote:
Originally Posted by Jerry Xu View Post
Question is if we should use the additive (blue bottle) in the newer cars?
Up to 2007, yes, it is stated as part of the Subaru recommeneded services. The protocol with the new blue coolant, not sure.
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