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Old 04-03-2013, 08:52 AM   #76
sgoldste01
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Quote:
Originally Posted by fistv View Post
The synthetic filters filter smaller particles out than paper. There are all kinds of definitive studies, this one just happened to be the first hit.
http://ezinearticles.com/?Oil-Filter...dia&id=6047869
Interesting read; thanks for sharing.

At this point my primary concern regarding any non-Subaru filter would be that the valves in the filter release at the pressure expected by the engine manufacturer.
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Old 04-03-2013, 09:16 AM   #77
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Quote:
Originally Posted by sgoldste01 View Post

Interesting read; thanks for sharing.

At this point my primary concern regarding any non-Subaru filter would be that the valves in the filter release at the pressure expected by the engine manufacturer.
That is my concern. I have read Subaru boxers move a lot more oil through the engine then other manufacturers.
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Old 04-03-2013, 09:49 AM   #78
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Originally Posted by flyboy1100 View Post
That is my concern. I have read Subaru boxers move a lot more oil through the engine then other manufacturers.
Interesting; I hadn't heard that. I assume it's because of the engine's horizontal configuration.
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Old 04-03-2013, 11:16 AM   #79
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Quote:
Originally Posted by flyboy1100 View Post
That is my concern. I have read Subaru boxers move a lot more oil through the engine then other manufacturers.
That appears to be an issue that I have just started seeing mentioned. On the jeeps 2.5 and 4.0 the anti-drain back valve was an issue, the lower priced frams and basic purolators were poor in this area, on a cold startup it would take 15 seconds to build pressure, with Mobil1, KN, Purolator pure ones it would build to 60psi in under 5, that was with a horizontally mounted filter. I wonder how Subaru handles a vertically mounted, with the mouth facing down, maybe a one way valve at the mount point, don't know. Nor do I know how long it takes this engine to build pressure due to lack of a pressure gauge.
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Old 04-03-2013, 11:26 AM   #80
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Quote:
Originally Posted by fistv View Post
That appears to be an issue that I have just started seeing mentioned. On the jeeps 2.5 and 4.0 the anti-drain back valve was an issue, the lower priced frams and basic purolators were poor in this area, on a cold startup it would take 15 seconds to build pressure, with Mobil1, KN, Purolator pure ones it would build to 60psi in under 5, that was with a horizontally mounted filter. I wonder how Subaru handles a vertically mounted, with the mouth facing down, maybe a one way valve at the mount point, don't know. Nor do I know how long it takes this engine to build pressure due to lack of a pressure gauge.
The filter is supposed to have anti drain back valve, but new oil will need to get to the filter as well, I assume it builds pressure pretty quick
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Old 04-03-2013, 12:04 PM   #81
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The filter is supposed to have anti drain back valve, but new oil will need to get to the filter as well, I assume it builds pressure pretty quick
Right. But don't oil filters also have a bypass valve that blows open at a specific PSI if the filter clogs? That's the valve I'm wondering about when deciding to use a non-Subaru filter.

I'm just making these numbers up, but if a Subaru filter's bypass valve blows open at 25 PSI, then I don't want an aftermarket filter that blows open at 15 PSI because then it's in bypass mode and not filtering when it should be. Likewise, I don't want an aftermarket filter that doesn't blow open its bypass valve until 35 PSI because that might starve the engine of oil.
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Old 04-03-2013, 12:17 PM   #82
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Originally Posted by sgoldste01 View Post
Right. But don't oil filters also have a bypass valve that blows open at a specific PSI if the filter clogs? That's the valve I'm wondering about when deciding to use a non-Subaru filter.

I'm just making these numbers up, but if a Subaru filter's bypass valve blows open at 25 PSI, then I don't want an aftermarket filter that blows open at 15 PSI because then it's in bypass mode and not filtering when it should be. Likewise, I don't want an aftermarket filter that doesn't blow open its bypass valve until 35 PSI because that might starve the engine of oil.
yes, subaru is 23 or 24psi (i think 23) and most alternatives are 13ish or lower. some are much higher though
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Old 04-03-2013, 12:33 PM   #83
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I would think a lower pressure bypass valve is better than a higher pressure valve. I wonder what the service manual says about this. Just because the filter they used is 23psi doesn't necessarily mean THAT is there requirement.

My theory goes the same for a fuse. If you blow a 20 amp fuse its ok to replace with a 15 amp if the circuit will support it without blowing, but if you put a 30 amp fuse in you could fry something before the fuse blows.
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Old 04-03-2013, 12:33 PM   #84
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You either:

Get a lower bypass rated filter for good flow but less filtering.
or
Get a higher bypass rated filter for good filtering but less flow.
or
Stay in the middle and use the OEM filter.
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Old 04-03-2013, 12:38 PM   #85
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Most of the bypasses, at least in the jeep straights, are in the filter mounting boss area, once that one goes the filter is bypassed completely, oil will flow but not be filtered, never seen it happen though. The oil never leaves the block when it happens.
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Old 04-03-2013, 01:05 PM   #86
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anyone ever use the K & P Reusable Oil Filter? Any comments on those?

www.kandpengineering.com
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Old 04-03-2013, 01:56 PM   #87
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Quote:
Originally Posted by jsteg View Post
I would think a lower pressure bypass valve is better than a higher pressure valve. I wonder what the service manual says about this. Just because the filter they used is 23psi doesn't necessarily mean THAT is there requirement.

My theory goes the same for a fuse. If you blow a 20 amp fuse its ok to replace with a 15 amp if the circuit will support it without blowing, but if you put a 30 amp fuse in you could fry something before the fuse blows.
Um, the filters are built to Subaru specs, which us why they spec them oem
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Old 04-03-2013, 03:10 PM   #88
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Originally Posted by flyboy1100 View Post

Um, the filters are built to Subaru specs, which us why they spec them oem
Is it? So, that same filter hasn't ever been used on a different engine? Or are you saying multiple engines have the same specs?

I'm just saying man, I seriously doubts lower pressure bypass valve is going to hurt anything. In theory, it shouldn't ever open anyways!
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Old 04-03-2013, 03:17 PM   #89
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Originally Posted by jsteg View Post

Is it? So, that same filter hasn't ever been used on a different engine? Or are you saying multiple engines have the same specs?

I'm just saying man, I seriously doubts lower pressure bypass valve is going to hurt anything. In theory, it shouldn't ever open anyways!
Pretty sure, yes. Why else would they change from Roki to Honeywell and a cheaper built filter other than pure economics?

I doubt you would really see any oil pressure differences either, but afaik those 2 filters are built to oem specs, everything else is close or well under. I would like to think your synthetic media would flow better, and I have time to kill at the dealer today so I will do some looking. So I'm that case lower bypass could be ok (as you stated)

On engine start when cold the bypass probably opens most of the time

Last edited by flyboy1100; 04-03-2013 at 03:41 PM.
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Old 04-03-2013, 03:52 PM   #90
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here is the spec for the filter from the manual

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Old 04-03-2013, 06:00 PM   #91
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Or just choose a larger filter that doesn't need such a high bypass rating and enjoy higher pressure on the clean side.
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Old 04-03-2013, 06:07 PM   #92
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Quote:
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Or just choose a larger filter that doesn't need such a high bypass rating and enjoy higher pressure on the clean side.
which i'm all for, is there one that will work?
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Old 04-03-2013, 06:24 PM   #93
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Quote:
Originally Posted by Commander Keen View Post
Mobil1 M-104
Purolator PL14459

Both are excellent and widely available.
i am guessing this
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Old 04-03-2013, 06:35 PM   #94
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Originally Posted by aeoporta View Post
i am guessing this
well, in another 12 oil changes when all my Roki's are gone i will have to dig this up
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Old 04-03-2013, 09:21 PM   #95
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Quote:
Originally Posted by lazyimpreza View Post
anyone ever use the K & P Reusable Oil Filter? Any comments on those?

www.kandpengineering.com

NO THANKS!!!!!!!!!!!!!!!!! Filtering air is one thing for a reusable filter, but nobody will ever convince me to re-use an oil filter, especially at the price they charge for one.

I believe K&N has one of these too.....

EDIT: Yep, here is the K&N "reusable" oil filter they say fits our cars. http://www.knfilters.com/search/prod...x?prod=SS-1010

Last edited by jsteg; 04-03-2013 at 09:23 PM. Reason: Link
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Old 04-03-2013, 09:27 PM   #96
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^^ Agreed.

Holy crap, $220 for an oil filter! If I can buy Subaru/Roki filters for $7 each, then that $220 pays for 31 Roki filters. If I get 6500 miles/filter, then 31 filters would last me over 200,000 miles.

I don't see how that product would compute for anyone!
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Old 04-03-2013, 09:34 PM   #97
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Quote:
Originally Posted by sgoldste01 View Post
^^ Agreed.

Holy crap, $220 for an oil filter! If I can buy Subaru/Roki filters for $7 each, then that $220 pays for 31 Roki filters. If I get 6500 miles/filter, then 31 filters would last me over 200,000 miles.

I don't see how that product would compute for anyone!

I'm with ya....even at $14/filter if you're using a royal purple or amsoil filter....still not worth it to me, and I just don't feel comfortable using an oil filter that's been "cleaned" with chemicals and dried with air.
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Old 04-03-2013, 10:05 PM   #98
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Quote:
Originally Posted by Commander Keen View Post
Mobil1 M-104
Purolator PL14459

Both are excellent and widely available.
I wonder why Amazon doesn't think these Purolator and Mobil1 filters don't fit our Imprezas. How do you know these are the correct filters for our cars?
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Old 04-03-2013, 10:14 PM   #99
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Many will physically fit. Then you have to look at the anti drain back valve, bypass pressure, can size, etc.

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Old 04-08-2013, 01:59 AM   #100
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Saw this Autotrader.com ad. A used 2012 Sport Limited at a Lincoln/Ford dealership with a Motorcraft Oil Filter. I've searched and can't find a cross reference. I'm tempted the call this place tomorrow to find out what part# that filter is. It looks big in the picture.

See page 3 of 4, lower right picture:

http://www.autotrader.com/cars-for-s...gIndex=3&Log=0
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