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Oil Filter? Help please

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Hello everybody,

So I am sick of paying the dealership 60 bucks to change my oil. I have been looking all over this forum and the internet and no one has a certain answer for an aftermarket filter that will work with my car. I have a 2009 2.5i with 30,000 miles. What filter can I buy without paying the dealership? Thank you

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Some people prefer the Suby filter and do their changes themselves.

There seems to be a lot of dislike for Fram, however, I have never had a problem with them and use them frequently. I use dino oil and change at 3k or so. Advance Auto has a lot of specials with 5 qts of oil and a filter and I do this a lot .



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use Amsoil filters for the 3.6 liter H6 on my LGT. I like the larger filter for more media filtration area. Wix filters are good too, as are the Purolator.
If you woke up today, you have another chance to do it right.
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You can basically use any filter that is designed to fit our cars. I've used bosch, purolator, fram, stp, mobil1, wix, and napa golds without any problems. I tried a k&n filter once and that was the only time I ever had a problem with a filter, the gasket appeared to be leaking a little oil when I went to remove the filter. I'll admit I have a tendency to over tighten oil filters, but it's never caused a leak any other time before with other filters that use a straight cut lathe style gasket, which is what the k&n uses. So I'm not sure what happened, if the filter had a bad gasket, or if the k&n just really didn't like being tightened a little too much.


Currently, I stick to OEM subaru filters for a few reasons.

1. They meet subarus bypass valve specification of 23.2psi.

2. Our oil pumps push at least a whopping 12.425 gallons of oil per minute at 5000rpm. I would assume the OEM filter media has been designed to accommodate for this high flow rate, though I have no proof of that.


So what does this mean?

1. The job of a bypass valve is to let oil bypass the oil filter media under certain conditions. In a subaru filter, it takes longer for the oil filter to let oil bypass the filter media since it specs a somewhat high 23.2 psi.

For awhile, the only way to get a filter that met this 23psi was to buy an oem subaru filter. Nowadays, more filters meet this spec, or come closer to it.


-The fram extraguard ph9715 specs a bypass valve (or release valve as fram calls it) setting of 16-28psi. No flow rate listed.

-The fram extraguard, doubleguard, toughguard, and ultra/xtended guard filters all spec a bypass valve setting of 13psi. No flow rates listed.

-The wix 57712 filter specs a bypass valve setting of 23psi. Flow rate listed is 9-11 gallons per minute.

-The purolator premium plus L14612 specs a bypass valve setting of 14-18psi. No flow rate listed.

-The purolator pureone PL14612 specs a bypass valve setting of 14-18psi. No flow rate listed.

-The K&N HP-1008 specs a bypass valve setting of 11-17psi. No flow rate listed.


2. The reason I mention flow rate is because on all the oil filter spec sheets I've seen, I've never seen a filter with a flow rate listed over 11 GPM. Most flow rates I've seen have been 8-11 GPM or 9-11 GPM I believe.


How you want to interpret this information is up to you. Can a filter with a flow rate listed of 9-11gpm actually flow more than what's listed? I don't know. What will happen if the oil pump is trying to push 12+ GPM though a filter that is only listed as being able to do 9-11 GPM? I don't know. Is it bad if some aftermarket filters have a bypass valve that opens at a pressure lower than 23psi? That's debatable. Why do some filters list a bypass valve pressure range? The thought is that the bypass valve starts to open when the pressure hits the low number, and the valve is fully open when the pressure hits the higher number. Purolator for example, the valve might start to open at 14psi, and is fully open at 18psi.


Heres some reading material if anyone is bored and wants to read more on bypass valve pressure and flow rate stuff.





So in the end, I'd recommend..

1. OEM subaru

2. Wix 57712 or Napa Gold 7712, the filters should be identical if wix is still making napa golds, which I think they are.

3. Fram PH9715


I probably told you way more than you wanted to know, but I figure it doesn't hurt to throw the info out there in case anyone does a search like this in the future.

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There's also this thing called a book with pages in it. Most of the time words are written on it. These "books" can be found in the oil filter section of just about any auto parts store or auto parts section.


Once said book is located, you look up your car under year, make, and model. There are corresponding brands and part numbers. You can reference them again if you stray too far down the aisle from the book.


Once you have located one, remove it from the shelf and pay the person standing behind the counter. They are usually friendly and are wearing some kind of name tag.


People like apexi put waaaay too much time and effort into this. Buy it, drain it, remove it, install it. Also, no tool should be needed to remove the oil filter. If you need one it was installed too tightly. I find it amazing one should have such trouble with such a simple task.


Hell, you don't even need the book. Ask a human person at said auto parts store and they can show you the way.

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I understand where LieutenantDan is coming from and respect his opinion. In the past, I have put a lot of time into researching way too much about oil, oil filters, and other maintenance items. And he's right any filter listed in the book will work.


Here's the problem though. 95% of aftermarket oil filters sold in stores are designed to fit a wide variety of cars. That's why the purolator 14612 filters spec a bypass valve setting of 14-18psi, because they aren't only used in subarus. It wasn't until recently that companies like Fram and Wix acknowledged that subaru engines are different, and we need to make a different filter specifically for their engines that spec this high filter bypass valve setting. So while you can safely use any filter listed in the book at an auto parts store, I'd personally prefer to use a filter designed with our engines in mind, and not some other "one size fits all" type filter where the company tried to strike a balance so that the filter could fit 10 other cars. Click the link below to see what I mean, that's all the applications for the purolator L14612 oil filter.



I guess it's just my personality, that I like to know this kind of stuff. If you're like me, you'll appreciate the info I've given. If you're not like me, just read the filter application book at the store and pick whatever filter you'd like.

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2.5i use the same filter as LGT. Another option is the Tokyo Roki filters made for the 2009+ Mazda RX-8, part number N3R1-14-302. Same diameter and bypass valve specification as the discontinued Subaru version, but a little taller.
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Go to fredbeansparts.com, you can order OEM filters easily.


As a side note, to answer the above question. Flow rate is determined by the pressure across the filter. If you try to flow too much oil through the filter, the pressure will build up and open the bypass valve. Subaru probably specs a higher bypass spec so that they can use standard filter media and run it at a higher pressure to obtain the desired flow.

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thanks for all the help. The reason I ask is because I have seen people talk about the OEM filters and how there is no aftermarket filter that works with our engines. My dealership charges 19.99 for the filters and I find that to be rather high. Thanks again.
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