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Old 07-10-2002, 12:02 AM   #1
BoMbErMAn
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Question H6 3.0 and 2.5liter oil filter difference?

Anyone know if there is a difference between the oil filters for the H6 3.0 engine and the EJ25 engine? I have an outback VDC.

Wondering because I got an oil change from a different dealer (moved to the east coast recently from WA State). The invoice from when I got my service back home in WA said it was a "SVX" oil filter, but the invoice over here in NJ said just a regular Impreza/Legacy filter. I'm hoping there isn't a difference.

I just want to make sure because I have yet to see a Legacy Outback with an H6 engine since I've arrived in the NY/NJ area a month ago. Maybe no one buys them here... ?

-Roy
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Old 07-10-2002, 12:08 AM   #2
Hiroki Tada
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I've heard somewhere that subaru uses the same oil filter for their entire model line since 93. So you should be ok I guess.
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Old 07-10-2002, 02:16 AM   #3
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Actually, even my 90 legacy uses that filter. If the Loyalle uses it too then than the only subaru since 88 that doesnt use it is the justy.
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Old 07-10-2002, 05:49 AM   #4
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Same filter. I have a 2000 Legacy GT and an Outback VDC, and both use exactly the same ones.

Enjoy
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Old 07-10-2002, 08:55 AM   #5
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The filter sizes are the same, but for some reason they use different part numbers. I was at autozone the other day, looking at the oil filters for both the 2.5L engines and the 3.3L svx engines, and there are two different oil filters. They had both in stock so I compared them, both the size and the threads on the oil filters were the same. Strange.

Jason
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Old 07-10-2002, 09:35 AM   #6
Legacy777
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Oil filters are the same on all the 2.2's, 2.5's, 3.0, (believe 2.0).....only one I'm not sure of is the 3.3 SVX motor.
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Old 07-10-2002, 09:51 AM   #7
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Quote:
Originally posted by 2.5GT
The filter sizes are the same, but for some reason they use different part numbers. I was at autozone the other day, looking at the oil filters for both the 2.5L engines and the 3.3L svx engines, and there are two different oil filters. They had both in stock so I compared them, both the size and the threads on the oil filters were the same. Strange.

Jason
I believe the difference is that the SVX filter has a concave endplate, while the 2.5L filter is more flat or even slightly convex. (By endplate I mean the flat part of the filter where the O-ring and threaded hole are ).

I discovered this while trying to find a Mobil1 filter to fit my car. They didn't list an application for the 2.5L, so I tried to reverse-engineer one by cross-referencing different part numbers from other brands I knew had a filter for the 2.5L. I came up with M104 (as I recall), which happened to be the SVX filter. Checked the threads, yep, looks good. When I went to install it I discovered that the thread engagement was really poor - only about 1-1/2 or 2 turns of the filter put the gasket against the block. Took the filter back off and compared it to the filter I had just removed and immediately noticed the different endplate shape. Fortunately, I had bought the correct Bosch filter at the same time, just in case the Mobil1 didn't work out, so I installed the Bosch instead.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 07-10-2002, 11:19 AM   #8
BoMbErMAn
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ok cool. so i dont have to worry about anything~

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Old 07-11-2002, 10:42 AM   #9
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As an aside, I know that the oil filter for a '90 Acura Integra is the one that Pat described above. When I go to do my oil changes, I have to look at the 'endplate' of the one I'm taking off to make sure I put the right one on...

So, Patrick, if you have a friend with a 2nd Gen Integra, he could make use of that Mobil 1 filter.

  - Eric
    Lil' Red '98 2.5 GT Wagon - Pics
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Old 07-11-2002, 11:33 AM   #10
cardin555
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Legacy, Forester, SVX, and Impreza all use the same filter. The difference is where they are made.
15208aa060 made in the usa
15208aa031 made in japan
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Old 07-12-2002, 02:44 AM   #11
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The filters look more or less the same (except as noted above) but the H6's (EZ30 and the SVX) spec a anti-drainback valve in the filter the Legacy/Impreza filters don't have. There may be differences in the relief valve pressure rating as well.

It's part of the reason you can get a Mobil1 filter for a H6 but they don't recommend one for a EJ25.
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Old 07-12-2002, 12:49 PM   #12
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I have both an SVX and Legacy GT Wagon(MY00). I can tell you that they do not use the same oil filters. Here is how it works, all the H-4's use the same oil filter while all the H-6's use the same oil filter. They may look the same but there is a reason why Subaru sells two different oil filters for two different applications. I would not doubt it if Subaru did not use the same threads on every car. But I do know that there is something different between the two oil filters. I suggest that you use the OEM filter that was originally designed for the H-6's and not the H-4's. I mean logically, there is a reason why SUbaru designed a completely different oil filter for two completely different engines.


As BG5 says I would have to agree with him on this issue.
Quote:
The filters look more or less the same (except as noted above) but the H6's (EZ30 and the SVX) spec a anti-drainback valve in the filter the Legacy/Impreza filters don't have. There may be differences in the relief valve pressure rating as well.
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Old 07-12-2002, 01:38 PM   #13
BoMbErMAn
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Unhappy

Hmm.. maybe I should have posted in the Maintenance section~??

anyways~
If thats the case (h4 and h6's using different oil filters).. then should I go back and verify? I doubt there would be damage done to the car if it were an H4 filter (cuz i've been running with it for awhile now). Is there anyway I can verify without bothering the dealer by looking at the filter? I already asked the service guy once about having my invoice say "Legacy/Impreza" oil filter and he told me that they print it out the same way for all Legacy's and Imprezas. I don't want to go back and make him think that I don't believe him or anything.

Well.. I don't~ hah. I don't think they work with Subaru's alot either, since they also deal with Lincolns, Mercurys, and Audis (Town Motors ~ Englewood, NJ). Also, I've noticed there are very few Subaru's here running around... I have yet to see an H6 Outback. They didn't even have one on the sales floor!

-Roy

Last edited by BoMbErMAn; 07-12-2002 at 01:52 PM.
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Old 07-12-2002, 02:03 PM   #14
cardin555
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Hell, if the engine blows, then you have the reciept to prove the dealer installed the wrong filter!

Take'em to the cleaners!

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Old 07-12-2002, 05:30 PM   #15
ImprezaWRXDriver
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I will try and find out the part numbers between the H4 oil filter and the H6 oil filter and then post it here so that way it will much clearer to distinguish.
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Old 07-12-2002, 10:52 PM   #16
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BoMbErMAn, We sell Porsche, Audi, Lincoln, Mercury, and SUBARU, we are expanding our new car shrowroom, and relocating the Porsche showroom, and adding 10 more lifts to our current 30 beacause of our booming business, to make more room for our other brands including Subaru. You didnt see that many Subarus beacause we have 4 parking lots and as you know Subarus are almost problem free compaired to other brands. If you have any questions about Subaru customer satisfaction scores PM me.


We have been for selling and servicing Subarus for many years, we have never had a problem with oil filters as far as I know. I got my grandmother a H-6 LL Bean and have serviced her car, with the Subaru oil filters, no problem.

Hope to see you again at your next service. Any questions feel free to PM me.


cardin 555, your very funny


G
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Old 07-13-2002, 12:35 PM   #17
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Default Backplate is the difference

I concur with Patrick Olsen here. I discovered this in a round about way trying to use aftermarket filters. The only concern really is that there is sufficient thread engagement between the filter and the filter stud (say 3 turns or so).

Most Subarus have a short filter stud (possibly even underspec I've discovered). The Subaru filters have the backplate convex (dished out) to ensure full thread engagement. Some aftermarket filters are such that they fit with no problem. Others that have the backplate concave (dished in) too much will have a problem. This is why Purolator has a 14459 filter (concave backplate) and a 14460 filter (convex backplate). (I think most people know of the Subaru Purolator OEM filter. The backplate construction matches the 14460 filter.)

Apparently the SVX and H6 don't need the convex backplate. They have a long enough stud to use the more typical concave backplate construction. If you use a filter with the convex backplate, you will simply have to spin the filter more to engage it. The ONLY possible negative I can see here is that interference might result between the backplate and the base of the filter stud IF the filter stud base sticks up from the plane of the gasket sealing surface. I do not believe that this is the case, but I can't speak with any certainty on it. If such interference were to occur, then the gasket would probably not be sealed fully and a leak could happen.

BTW, the Subaru Purolator OEM filter (for H4 engine) I cut open recently did NOT have an anti-drain back valve as has been mentioned. I have no idea if the OEM filter for the H6 engine has one or not. What is the mounting position of the filter on the H6 engine anyway?

I was bound and determined to use a particular aftermarket filter. I ended up putting an Aluminum washer under the filter stud in order to make it stick out a couple of millimeters further. Worked like a charm. However, if I now put a Subaru specific filter on, I might have the interference that I spoke of above.
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