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Old 08-19-2001, 04:11 PM   #1
P.K. Motorsports
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Arrow EJ25 oil filters

I have two aims in creating this thread: First, to relay my experiences with oil filters. Second, to accumulate information about oil filers for the EJ25.

My '99 RS had a steady diet of Bosch oil filters from oil change one until today. I recently moved to an area remote from any Autozone and so had to buy a different brand of filter. I had heard many positive comments about Wix (NAPA Gold) filters and decided to try one of these.

The part number on the Bosch filters I've always used is 3310. These are about 3" in diameter and about 2.5" tall. The NAPA gold part number listed for the '99 EJ25 is 1365. Prior to 199, the part number is 1334.

The 1365 is noticibly smaller than the Bosch or the Subaru OEM Purolator. It is about 2.5" in diameter and 2.5" tall. However great the filter material in the Wix might be, there is only room for 70% as much of it relative to the Bosch 3310.

The 1334, on the other hand, is even larger than the Bosch. It appeared to be about 3.25" in diameter and 2.75" in height. The threads and rubber gasket were identical in dimensions to the 1365 and I have every confidence that the 1334 would screw on to the '98- EJ25 as though it were designed to do exactly that. I do not know if it has the required valve or not.

Anyway, this oil change has aroused my curiosity and I would appreciate your help. Please post if you have measurements and a part number on another brand of filter.


Thanks,

PK
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Old 08-20-2001, 04:08 PM   #2
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Well I read all of your interesting thread but I can't really help much. I buy only genuine Subaru filters--which as has been noted before seem to be indentical in every way to the regular Purolator filter found at many autoparts store. (Except a missing "subaru" label.)
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Old 08-20-2001, 04:22 PM   #3
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Three other filters to take a look at for performance are :

1) Mobil 1
2) K&N
3) Trasko

The K&N and Trasko ones IIRC are re-useable.
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Old 08-20-2001, 05:32 PM   #4
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Read this or just go buy a Puralator PurOne.

http://members.nbci.com/minimopar/oilfilterstudy.html
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Old 08-20-2001, 11:03 PM   #5
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Question The magical, mysterious Mobil 1

Anyone know the part number for the EJ25 Mobil 1? It's never in the books.

Colin - could I ask you to measure your OEM filter?

skidplatez - do you have the dimensions on one of those Purolator Ones?
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Old 08-21-2001, 12:28 AM   #6
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Hey Pk,

The OEM Puralator filter is 3" diamater and 3" tall. This shouldn't matter. It depends on what they use as the material inside. The oem filter for my dad's landcruiser is tiny relative to the aftermarket ones. As long as the filter fits over the seal tightly, it should be fine.

-JOE

EDIT: Hey Pk, puralator makes the OEM ones for subaru. I'm holding a Oem one and it says puralator all over it.
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Old 08-21-2001, 09:33 AM   #7
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I, too, use the Bosch filters, so I'm no help either. I do 3000 mile oil changes, so I'm sure other filters would work just fine, but I like to throw money at my car so I spend the extra couple bucks.

Anyway, I wanted to point out that there is not a Mobil1 filter for the 2.5RS. If you cross-reference all the part numbers, you might think that the MI104 (which is the SVX filter) will work. It appears to be the right size, and the threads are also the correct size. However, the endplate of the filter is concave (rather than flat like the correct filters are) so when you thread the MI104 onto an EJ25 you'll only get about 1 - 1.5 turns of thread engagement before the gasket contacts the block. I'm sure there are guys using these filters without problems, but there's not a chance in hell I'm going to trust that fitment. I wouldn't trust such a small amount of thread engagement for any critical part.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 08-21-2001, 04:04 PM   #8
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I've cut up several EJ25 specified oil filters and the only ones I would use are:

- Subaru OEM (Purolator)

- Purolator L14460 and it's derivatives (Pure-One PL14460, and that other brand they sell at PepBoys) Note the Purolator's have a flat gasket compared to the OEM convex gasket. And for readers of the mini-mopar filter review, these Purolators have a metal clip holding the filter media ends instead of a string.

- Bosch 3310 (only thing being the bypass valve opens at
a somewhat lower pressure than the Purolator's. The filtering media while of a smaller area than OEM, seems to be of slightly better quality)

or if I had some more $$ a reusable CantonMecca filter.

Haven't looked at a K&N or Trasko.

I've cut open several new Wix based filters (Napa Gold, Castrol +) and found poorly glued media ends on most of them (one had already come apart at the seam -- meaning the oil would have gone thru unfiltered from day 1).

All other filters (Amsoil, Hastings, Fram, Mobil1, Pennzoil, etc. ) cross to a honda app and so the thread engagement is less than ideal like Pat mentioned and they all have anti-drainback valve's -- not the best thing for performance. ADV's are known to cause startup lifter noise on Subaru's...

PK, if you need some 3310's I have a few left over I can give you.

Last edited by BG5; 08-21-2001 at 04:12 PM.
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Old 08-22-2001, 01:36 PM   #9
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Where do you guys get Bosch filters? I don't think I've ever seen them anywhere.
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Old 08-22-2001, 06:25 PM   #10
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Around here Bosch filters are sold at all Autozone locations. I don't know of any other retailer of Bosch products. For myself, I use purolator in my RS. Just recently I purchased a Bosch filter for my wifes P5.
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Old 08-24-2001, 12:04 AM   #11
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Default Check your PMs

I'd be happy to take those 3310s off your hands.

I know the Mobil 1 issue has been hashed over again and again. There is a Mobil 1 which is different than the SVX filter which some members are using. I just can't find the part number using a search, although I know I've seen it posted before.

Anyway, the Wix seems to have been a general disappointment. Just a word of caution to those who are using them or considering it.

Where can I find the PureOne? I don't recall seeing one of those locally.
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Old 08-24-2001, 01:35 AM   #12
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P5???
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Old 08-24-2001, 06:08 PM   #13
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P5????? I knew someone would probably ask
That would be a Porsche 5th generation 911T.


Ok, so I'm dreaming, but someday I will have one maybe not a 911 though. Really P5 is my acronym for Protege 5 which is the car my lovely wife drives and loves.
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Old 08-24-2001, 06:14 PM   #14
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the NAPA #1334 is the correct one..also known as a Fram # ph3593a. all ej25's use this size....
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Old 08-24-2001, 06:20 PM   #15
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Default dollar for dollar

The Bosches are the best filters. A friend of mine works at the AZ and can some times find a larger filter with the same valving and inlet size, but for the Subaru he had no luck. Generally speaking a larger filter is better(more cleaning area), all other things being equal. On my Corolla GTS I ran a filter about twice the size of the stock one.

Note: All of you prabably know but, always prime the filter before installing it.
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Old 08-24-2001, 06:35 PM   #16
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p.k., what's the feasibility of just ordering the filters online from www.autozone.com? buy in bulk to save on shipping, and...no tax.
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Old 08-26-2001, 11:45 PM   #17
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GTkrockett - AutoZone.com will charge you CA sales tax. Better to just stock up next time you visit the store. Edit: whoops, I was thinking of Arcata, not Arcadia. One is definitely closer to Oregon than the other!

sidewayz - The books definitely show the #1365 as the filter for '98- Subarus. The #1334 is listed for pre-'97s. Perhaps we should e-mail Napa. Is the #1334 really made by Fram though?

By the way, the part number for the Mobil 1 is #104. I will find one to measure next weekend.

Last edited by P.K. Motorsports; 08-28-2001 at 11:59 PM.
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Old 08-27-2001, 09:47 PM   #18
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I bought three new filters the day I got my RS (oem filters) time for the first oil change, and suprise they are Purolator. Probably an O.K. filter, but I wanted the jap. nippon filter. Anybody know how I can get them?
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Old 08-28-2001, 02:58 AM   #19
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Thumbs up

i would recommend AMSOIL. i think mine is sdf36 or 86, i can't remember. the guy who i bought my car from was big on it, so he made me too. what i've heard is that AMSOIL is the best. i'm not any oil filter expert, i'm just throwin in my dos centavos.
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Old 08-28-2001, 05:59 PM   #20
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Hmm, well based on all the info here, there is nothing that suggests using anything other than the OEM filter provides any benefit. I stick to buying to using the OEM until somebody can provide some hard fact as to why a filter not specifically made for the 2.5 RS is better than one that is.

The main issues in my mind are quality of the filtering agent(s), proper valving, and the ability to withstand the high pressures that our engines produce. It doesn't seem anybody has enough data to even cover the valving issue with all the non-OEM filters.

- Steve
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Old 08-28-2001, 06:36 PM   #21
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Default hmmm

well if you want to get technical. The relleged "oem" units you are using are made by purolator, which in turn is marketed inder several other names.

Autozone(and other retailers) have a catalog which shows not only part number per car but thread pitch and size, valving and diameter of sealing ring. Using these values you can sometimes find a larger filter with the same characteristics (I couldnt for the subie.)

Bosch filters use a semi-synthetic filtering membrane which is rellegedly superior to all paper. Thats why I like em.

Using "oem" only, you may end up with the same filter sold at "jimbobs auto parts" down the street. Lets try to avoid getting "dealer only" uppity, a lot of times there is a superior non-stock part available. Example- stock Champion spark plugs.
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Old 08-28-2001, 10:56 PM   #22
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It's not about the dealer at all. We all know, don't we, that Subaru in their owner's manual actually specs the NGK plugs, not Champions? I can't explain why they are shipped with crap plugs, and spec a plug which we all know is about as good as it gets. I switched to the NGKs, BTW. If you want to buy the Purolator filter (I have bought these at Advance Auto, BTW), which is the same as the OEM unit, more power to ya - same thing, you're just spending your money at a different place for the same product with the same specs, right?

I wanted to go with Amsoil - I run Series 2000 0w-30 in the engine (Redline in the tranny...) - but it appears the valve is less than ideal. Based on Amsoils product quality, I have no doubt that they are superior, even to Bosch, but I don't want to risk the fitment issue. As to the Bosch, BG5 (above) reports that the valve is not the same spec. I figure, why risk it? I'm running the best synthetic oil you can buy, changing it every 3k or less - you really think using a supposedly superior filter to the OEM one given what I'm doing really matters all that much? Probably not. Now, if there were an oil filter that obviously helped performance in some way, I'd be real interested. IMO I dont' need a filter that will last three oil changes... That said, if I knew, based on the fact presented, that there wasn't a fitment issue, and new the filtering material was superior, I'd be all over it.

Here's some technical info I'll add. Next time you change your oil filter, take note of how close the oil filter is to the headers on the 2.5. Certainly this is not ideal as one side of the filter will always be much hotter than the rest. Do you really want a larger diameter filter than sits even closer to the header? Something to think about. Perhaps this is why people aren't find filters over OEM spec'd size.

P.K. - I hope you get back to us and thanks for providing some numbers.

- Steve

Last edited by zzyzx; 08-28-2001 at 11:06 PM.
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Old 08-29-2001, 12:08 AM   #23
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Default I concur

I agree with everything you said except about the valving being different from stock on the Bosch. I dont know where BG5 got the info. My friend says this is incorrect.
Also in refernce to the larger filter my experience has been a longer filter, not wider. Altho these may exist. Thats one of the reasons I looked so hard is that there is plenty of room for a longer filter.
Anyway to each his own, I think in the grand scheme of things they are all pretty close. I liked the bosch for the filtering media which BG5 seems to have found superior as well.
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Old 08-30-2001, 02:34 AM   #24
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so what's the bosche number for the 00-01 rs's ? is it the same as the 99 or is it different?
Thanks,
Robert
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Old 08-30-2001, 03:04 AM   #25
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Default What os the part number for Bosch for '02 RS2.5?

Subysouth?
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