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Old 02-01-2004, 03:32 PM   #1
Rally1
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Question Dirty air filter, photo, please advise.

Changed my filter today (finally), and it looks pretty nasty:





That's at 20,000 miles. I have the "snorkle" removed.

The new (stock) filter is more yellow than red.

I presume I should have changed it a lot earlier? Maybe evey 10k from now on?
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Old 02-01-2004, 03:39 PM   #2
Uncle Scotty
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At least you can tell what color it started out as..... I have seen worse.
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Old 02-01-2004, 03:54 PM   #3
Rally1
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Well the car goes into the dealer tomorrow to try to get the clutch shudder fixed, and warranty my front brakes. So i figured i'd take care of everything else, lest they are tempted to do it and charge me for it!
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Old 02-01-2004, 04:02 PM   #4
drees
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Keep in mind that a dirty air filter will filter out more dirt than a clean air filter.

Subaru (IIRC) recommends 30k between air filter changes.

You can't hurt anything by not changing the air filter soon enough or too often, although performance and gas mileage may slightly degrade if it really gets clogged.

Someone out there sells a gauge which you can install into the airbox which measures the pressure drop after the filter vs atmo pressure and lets you know when the filter really gets clogged. This is the best way to know when it's time to change the filter. Filter Minder I've been thinking about trying one myself, but not sure where to buy one.
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Old 02-01-2004, 04:56 PM   #5
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Quote:
Keep in mind that a dirty air filter will filter out more dirt than a clean air filter.
Ah, yeah, that may be, but nor will it let in as much air as a clean filter. I don't' think that's necessarily a good trade off.
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Old 02-01-2004, 07:28 PM   #6
InfamousDX
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I thought Subaru recommended every 30K to change the air filter but my dealership sent me a reminder for 15K mile service and on the list of things to be done it said air filter... so beats me.
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Old 02-02-2004, 12:31 AM   #7
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Well, at least they're relatively cheap. $5 or so from the autostore, a little more if you get the genuine subaru filter.
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Old 02-02-2004, 10:19 AM   #8
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When I used paper filters, I changed them every 15k. With the K and N, I clean it every 10k or so.


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Old 02-02-2004, 12:06 PM   #9
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Mine looked worse. Remember that we had a couple little fires in November that have thrown soot in the air for the last few months.
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Old 02-03-2004, 05:11 AM   #10
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As noted, they're cheap and easy to change, and perform an important function, so why not change them every year/15k? My local independent Subaru mechanic also suggests changing the air filter every year, and they definitely don't push extra work.
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Old 02-04-2004, 01:39 AM   #11
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Quote:
Originally posted by drees
Keep in mind that a dirty air filter will filter out more dirt than a clean air filter.

That applies to K&N type filters, but I don't think paper ones since they don't rely on oil for filtration and have smaller passageways.

I changed mine at 10K miles because of the fires too (otherwise I would've done it later), and some sections had a black, sooty residue.

I just use the Purolater ones from Pep Boys, pretty cheap and high-quality.
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Old 02-05-2004, 09:41 AM   #12
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Impreza GC8 looks fine

It really looks fine. You could go longer, perhaps 30k miles. The current Subaru change interval is 60k miles. Of course, it depends were you live, as some areas are much more dusty than others. But yours looks fine.

The new yellow OEM filters are excellent! They are oiled paper filters and are of much higher quality than any aftermarket filter I have seen.
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Old 02-13-2004, 01:12 PM   #13
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The manual says 30k, unless you have lot of dust etc.

They are not easy to change either, at least on the 02/03 WRX.
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Old 02-13-2004, 01:43 PM   #14
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Quote:
Originally posted by Mike Wevrick
The manual says 30k, unless you have lot of dust etc.

They are not easy to change either, at least on the 02/03 WRX.
Are you saying the air filter is hard to change on the WRX? It' s very easy, and a lot easier than the one on the Talon.
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Old 02-13-2004, 02:39 PM   #15
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Yes; on my 03 there is a ton of stuff attached to the top of the housing that gets in the way and makes it tough to open and especially to close.

Don't know about Talons but its certainly a lot harder than my previous Subies.
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Old 02-13-2004, 02:49 PM   #16
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Be thankful you dont have a DSM then! You have to dissconnect IC pipes and hoses, and pullout the whole airbox to get at the filters on the those Mitsu 2.0's.
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Old 02-14-2004, 07:24 PM   #17
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Lightbulb

Put in a K&N filter... never needs changing, and clean once every 50k miles, and you also get about 2% improved airflow.

(edit: heh K&R.. too much programming for me!)

Last edited by hys420; 02-17-2004 at 09:07 AM.
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Old 02-15-2004, 09:20 AM   #18
kenchan
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oh, thought the K&N's need to be cleaned once every 30k miles.

I pulled mine out the other day and it looked pretty clean.
(at 25k miles).
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