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Old 01-15-2005, 12:22 PM   #1
ludecrous
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Question Best Oil filter is a WIX?

I have read a lot about WIX filters recently and wondered if the claimed superiority was true. There are quite a few websites written by people who chopped into various brands of oil filters to look at the quality of manufacture and the internal components used - there is high praise for WIX brand.

I recently purchased one of these filters (I normally use FRAM) and I noticed that the WIX is heaver, I also noticed the Anti drainback valve which most other brands don't have - I'm unsure how much the drainback valve will affect the Subaru due to the low point verticalorientation to which the oil would seem to drain down to anyway, maybe the drainback valve is more effective on cars where the filter is mounted to the side of the engine. I also noted it cost me about $2.50 more than a Fram.

Here is a link for the WIX
http://www.wixfilters.com/productinformation/index.html

Heres links for some subjective reading on multiple different brands and tests of filters.
http://minimopar.knizefamily.net/oilfilters.html
http://minimopar.knizefamily.net/oilfilterstudy.html

Anyone have any experience with these issues, please post up.
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Old 01-15-2005, 12:25 PM   #2
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The "best" filter is a bypass unit, but none of us are going to spend $200+ on one of those. They filter about 100000% better than Wix and every other filter on the planet.

You don't read the sticky's at the top of this forum do you?
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Old 01-15-2005, 12:34 PM   #3
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I use the Wix filters because of the reaaons you noted and because they are larger. Anything, btw, is better than a Fram filter.
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Old 01-15-2005, 12:47 PM   #4
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OE Subaru has 2X the filter media. Fact!!! Always go with OEM. . cant go wrong.It Doesnt just fit. . .it matches.
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Old 01-15-2005, 01:32 PM   #5
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I use OE filters on my "driven every day" cars.

But on my old rally car (not a Subaru), I use NAPA/Wix, and here's why: my engine builder said Wix are superior not for their filtering but for their flow capabilities. They are less likely to clog and cause oil flow problems.

On a race/rally car, you're changing your oil/filter usually before every event, so the chances of a big build up of particles in the oil is pretty minimal. Therefore you only need something that will stop larger and potentially damaging bits of metal from getting into the oil system.

Interesting logic, but it makes sense.
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Old 01-15-2005, 04:32 PM   #6
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Quote:
Originally Posted by ADR 04STi
OE Subaru has 2X the filter media. Fact!!! Always go with OEM. . cant go wrong.It Doesnt just fit. . .it matches.
2X??? No. It's a Purolator. Its a good filter, but its nothing special.
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Old 01-15-2005, 05:32 PM   #7
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Only problem with the Wix filter is that, like the crappy Frams, there is no Subaru-specific filter. Purolator makes a specific filter for our cars that has the mounting threads in the right place and no anti-drainback valve. Yet another reason to use Purolators.

And yes, an anti-drainback valve is totally unnecessary for our cars.
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Old 01-15-2005, 05:52 PM   #8
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The Purolator PL14612 filter specified for the 2004 & 2005 WRX & STi has an anti-drainback valve. The old PL14460 version did not have an anti-drainback valve. I wonder why Purolator changed to an anti-drainback valve design on the new 'small' oil filters.
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Old 01-15-2005, 06:04 PM   #9
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Quote:
Originally Posted by jac04
I wonder why Purolator changed to an anti-drainback valve design on the new 'small' oil filters.
It may be designed to fit another car that needs it.
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Old 01-15-2005, 06:31 PM   #10
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Anti drainback valve- is this unecessary because of the location of the oil filter on the subaru? at the btm of the engine or is it for some other reason.
I guessed the anti drainback valave would be more usefull on a filter mounted horizontally to the side of an engine, like most Hondas. Could someone explain how this works?

Also the Wix filter, I kinda thought it there was one specifically for the Subaru Wrx PN 51334 on a 2005 its a 51365 for some reason.

Unabomber - yes I read the FAQ at the top. v.good content, but did not address the drainback valve and Wix stuff as specific as some of the replies here. Hence my post.
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Old 01-16-2005, 11:42 PM   #11
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If we are talking about the STi filter (080) then YES, the OE filter has 2 times the filter area compared to the WIX. That's a huge difference. How do I know? I cut them both open and measured everything. I took pics too for all of the naysayers. Scroll through all of my pics and then make your own decision. It's rather obvious though.

http://www.bescaredracing.com/sti/oi...re/oem_vs_wix/

This is the OEM 080 against the wix 51365. I would recommend that if you want to use a wix to use the longer 51356 shown in one of the pics above.

t
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Old 01-17-2005, 08:41 AM   #12
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can you do the same with an Amsoil SDF-13 and SDF-20?


Quote:
Originally Posted by WolfPlayer
If we are talking about the STi filter (080) then YES, the OE filter has 2 times the filter area compared to the WIX. That's a huge difference. How do I know? I cut them both open and measured everything. I took pics too for all of the naysayers. Scroll through all of my pics and then make your own decision. It's rather obvious though.

http://www.bescaredracing.com/sti/oi...re/oem_vs_wix/

This is the OEM 080 against the wix 51365. I would recommend that if you want to use a wix to use the longer 51356 shown in one of the pics above.

t
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Old 01-17-2005, 09:35 AM   #13
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Quote:
Originally Posted by WolfPlayer
If we are talking about the STi filter (080) then YES, the OE filter has 2 times the filter area compared to the WIX.
Ah, true, true. I use the 51334, which is huge compared to the others and not listed for turbo applications.
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Old 01-17-2005, 09:45 AM   #14
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Wolfplayer - nice pics. If you used the wix 51356 (longer one) would it be too close to the ground, or hang lower than the undercar plastic cover? potentially exposing it to more damage?
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Old 01-17-2005, 12:39 PM   #15
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Quote:
Originally Posted by WolfPlayer
If we are talking about the STi filter (080) then YES, the OE filter has 2 times the filter area compared to the WIX. That's a huge difference. How do I know? I cut them both open and measured everything. I took pics too for all of the naysayers. Scroll through all of my pics and then make your own decision. It's rather obvious though.

http://www.bescaredracing.com/sti/oi...re/oem_vs_wix/

This is the OEM 080 against the wix 51365. I would recommend that if you want to use a wix to use the longer 51356 shown in one of the pics above.

t
Great work! Thanks for sharing your results and I agree with OEM or use the longer WIX.
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Old 01-17-2005, 05:12 PM   #16
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If you guys want to check out my full analysis .... click on this link to my full writeup on IWS ...

http://www.imprezawrxsti.com/postnuk...wtopic&t=16625
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Old 01-17-2005, 09:09 PM   #17
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Waiting for you to do the amsoil filter. Till then you are only speculating. And I'd like to see some first pass yield tests too. How they look does'nt mean much to me unless you are comparing used filters. I'm interrested in how they work. I use the amsoil sdf36. Cutting open a new filter to decide that it's the best is useless and a waste of time. The only thing you establish is that the oem filter has more surface area. Does that mean that it filters particles out better? Not necessarily. At best it means that the filter might last longer.
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Old 01-18-2005, 08:54 AM   #18
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Quote:
Originally Posted by Tim Sanderson
Waiting for you to do the amsoil filter. Till then you are only speculating. And I'd like to see some first pass yield tests too. How they look does'nt mean much to me unless you are comparing used filters. I'm interrested in how they work. I use the amsoil sdf36. Cutting open a new filter to decide that it's the best is useless and a waste of time. The only thing you establish is that the oem filter has more surface area. Does that mean that it filters particles out better? Not necessarily. At best it means that the filter might last longer.
Of course you are right - that is not debatable. However, find someone with the equipment to fully test 20 oil filters and I'll pitch in $200 to the cause. Until then, we're all going to have to be satisfied with just dimensions and pictures ... because nobody can afford to do the tests that we all want (including me). SOMETHING is better than nothing. My something at least gives people the chance to take a look inside and make their own decisions. When you know nothing about a filter then I would rather run one that has twice the surface area, better construction, better quality, and is OEM then running something that is less clean, has poorer construction, half the surface area, and not specifically designed by Subaru for the application. I'm not specifically talking about the WIX here. In fact, I really like the WIX. The quality was very nice, it was very clean, and the design is excellent because of the top bypass. However, I wouldn't use the small one. I would opt for the longer one. I have a sandwich adapter on my car for oil pressure and oil temperature. It lowers my stock oil filter about as much as would just running the longer WIX filter. So, there will be no interference problems with running the longer WIX if you don't have a sandwich adapter.

t
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Old 01-18-2005, 10:35 AM   #19
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A lot of good information here. I think we all want a good filter on our cars, but do we need a "great" filter or even the "best" filter? Any of us truely interested in this discussion undoubtably change the oil in our engines on a regular basis. In fact, probably more often than we need to. The more often you change the oil, the less important the oil filter becomes. If the oil never gets dirty to begin with, what's the point of an extra 10 square inches of filter media?

I'm not advocating the use of Fram filters, however I don't believe any of us need to spend $10 on an oil filter.
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Old 01-18-2005, 11:48 AM   #20
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Quote:
Originally Posted by OneOBS
If the oil never gets dirty to begin with, what's the point of an extra 10 square inches of filter media?
True. However, with the WIX we are talking about almost 60 sq inches of difference, not 10. The stock 080 had about ~112in^2 and the WIX had ~64in^2.

Quote:
Originally Posted by OneOBS
I don't believe any of us need to spend $10 on an oil filter.
I agree. That's why I like the stock filter. It's like $5.XX when you guy it online. That's cheaper than Amsoil, Mobil 1, K&N, and the WIX.

t
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Old 01-18-2005, 12:58 PM   #21
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Quote:
Originally Posted by Tim Sanderson
Waiting for you to do the amsoil filter. Till then you are only speculating. And I'd like to see some first pass yield tests too. How they look does'nt mean much to me unless you are comparing used filters. I'm interrested in how they work. I use the amsoil sdf36. Cutting open a new filter to decide that it's the best is useless and a waste of time. The only thing you establish is that the oem filter has more surface area. Does that mean that it filters particles out better? Not necessarily. At best it means that the filter might last longer.
Do you have any ground clearance issues with the SDF 36? - I mean its 1.4" closer to pavement or dirt...
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Old 01-18-2005, 03:32 PM   #22
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Quote:
Originally Posted by subarurabbit
Do you have any ground clearance issues with the SDF 36? - I mean its 1.4" closer to pavement or dirt...
The oil pan is much lower hanging than the oil filter...
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Old 01-18-2005, 08:40 PM   #23
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Quote:
Originally Posted by subarurabbit
Do you have any ground clearance issues with the SDF 36? - I mean its 1.4" closer to pavement or dirt...
I've been using this filter for 47k miles(not the same one obvoiusly). No issues. I've auto crossed with it also. Suspension is stock springs and kyb agx's, stock front sway, and stock upper strut mounts. 127k+ miles on car.

Last edited by Tim Sanderson; 01-18-2005 at 08:45 PM.
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Old 01-20-2005, 12:56 PM   #24
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how about that - its the same price as an sdf-20.
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Old 01-20-2005, 06:59 PM   #25
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Quote:
Originally Posted by subarurabbit
how about that - its the same price as an sdf-20.
ANother reason I went with the big one.
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