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-   -   Oil Filter question on the 5th gen (http://legacygt.com/forums/showthread.php?t=147429)

Waaazooo 10-11-2010 12:23 PM

Oil Filter question on the 5th gen
 
Whats the benefit of using a larger oil filter on a car? There are many oil filters for our cars, some are larger some are smaller. Whats the benefit/loss?

Jett 10-11-2010 12:35 PM

The smaller it is, the faster it will get dirty. Go big, keep your oil cleaner longer.

Waaazooo 10-11-2010 12:40 PM

that makes total sense, I wonder why it was so difficult for me. lol

Blizzard 10-11-2010 01:35 PM

This reminds me, there is a noticeable difference in size between the Wix oil filter and the Purolator PureOne spec'd for these cars. Maybe I will post a picture later.

stingray1967 10-11-2010 02:09 PM

I don't know what the answer to this is, but I think each oil filter has a blowby pressure figure attached to it. Hopefully each filter is rated correctly so the oil pressure in the engine is OK. (sorry, running with a deficit of info here)

Waaazooo 10-11-2010 02:20 PM

Quote:

Originally Posted by Blizzard (Post 3125553)
This reminds me, there is a noticeable difference in size between the Wix oil filter and the Purolator PureOne spec'd for these cars. Maybe I will post a picture later.

Well I put the one from a 2002 Wrx on my car. Its the bosch 3310, our car called for a 3300, it seems to be larger than the Subaru one and the Fram I had been using. In facts it better fit in the car, its very close (1/8 in) to the air inlet side of the turbo. I had read that some subie shops are using these larger WRX filter on ej257's, even though they were made for the ej205 (depending on if they had aftermarket headers or not). Unfortunately I don't have an Oil Pressure gauge in the car... Its in the garage with the other 2k in gauges that we can't use in our ultra sophisticate Legacy's :madashell:

Quote:

Originally Posted by stingray1967 (Post 3125588)
I don't know what the answer to this is, but I think each oil filter has a blowby pressure figure attached to it. Hopefully each filter is rated correctly so the oil pressure in the engine is OK. (sorry, running with a deficit of info here)

I am completely speculating here....

Wouldn't the difference be relatively low? Many different manufacturers are making the same application of filter in different sizes. If there was a difference, I would think it would lower the pressure because the filter has a larger sump.

MikeNH 10-11-2010 02:24 PM

Google oil filter study to see the differences in filter quality. Frankly since I don't plan on keeping this beyond the warranty I plan to run OE filters to avoid any hassle if/when it develops issues.

Waaazooo 10-11-2010 02:38 PM

Do you think that SOA will try to make a warranty issue out of a Fram or Bosch Oil filter?

MikeNH 10-11-2010 03:13 PM

They could try. And warranty issues aside, from my time working on cars and doing my own hands on research, I wouldn't let my worst enemy run a Fram filter on their engine. Junk.

I can tell you for a fact that when I was at the dealer (04-07) Fram filters had lousy anti-drainback valves (keeps the filter from draining out) and would result in cold start knock/rattle from the engine due to a short lack of lubrication. There was a TSB for it.

blklgt05 10-11-2010 04:31 PM

I've been using Bosch's oil filter for a while, but I change my oil every 3,750miles so it really doesn't matter how big or small. Some people with the older LGT had problems with bigger oil filters cuz it was too close to the exhaust manifold and it tends to get too hot and caused problems for some, I don't remember what they were. I don't really know if that's a problem with 2010s though.

Another thing which I'm not sure carried through to the 2010s, but with the previous gen LGTs, there were this problem with the banjo bolt. It has an oil filter inside that filters the oil going into the turbo. Apparently there were some members that probably didn't do oil changes eventually blew their turbo due to that banjo filter getting clogged up which prevented oil from going to the turbo. So the best way other than removing the filter was simply changing oil/filter every 3750miles. I had my 05 LGT for 100,000miles with 40k~50k miles stg2 protuned and still running strong until the day i got rid of it with tons of abuse. So, conclusion, don't matter what filter, just change your oil every 3,750miles.

Blizzard 10-11-2010 09:13 PM

Quote:

Originally Posted by Waaazooo (Post 3125605)
Unfortunately I don't have an Oil Pressure gauge in the car... Its in the garage with the other 2k in gauges that we can't use in our ultra sophisticate Legacy's :madashell:

Huh? Subielover just hooked up oil temp/pressure gauges?

Peaty 10-11-2010 10:57 PM

Subaru went to the smaller filter on the turbo motors because the header was too close to the filter itself and cooked the oil at idle. At one time they had the 80mm filter on the NA motor and the 68mm on the Turbo. Eventually, most likely due to stocking simplicity, they went with the small filter on both motors. Also, the size of the filter really does not tell how well it filters, it's the media the filter is made out of. Truth be told the smaller filter for the H4 had more usable surface area than the larger one (I have the exact numbers from Subaru on scoobymods) I also talked to a tec at Wix and he said the same thing, you really need to know what the filter itself is made out of not the size of the filter itself.

As far as warranty issues, unless Subaru gives you filters free they can't tell you what kind to put on your car. Purolator use to make filters for Subaru now the blue ones are Honeywell aka prestone /Fram. I still have some of the black OEM filters before they switched to the blue honeywell ones. But for aftermarket I like WIX or M1 myself. Lots of info here:

http://www.scoobymods.com/oil-change-guide-t3014.html

GravityGear 10-11-2010 11:01 PM

oil change tomorrow. got the bosch 3300

Waaazooo 10-12-2010 08:20 AM

Well, the oil filter isn't really near a header anymore. And subiepvers gauges are down by the shifter and he custom faber the gauge housing.

Blizzard 10-12-2010 09:58 AM

Quote:

Originally Posted by Waaazooo (Post 3126516)
Well, the oil filter isn't really near a header anymore. And subiepvers gauges are down by the shifter and he custom faber the gauge housing.

Whats stopping you from using gauge holders like these?

http://i32.photobucket.com/albums/d5...g?t=1286899095

Mounted like this?

http://i32.photobucket.com/albums/d5...g?t=1286899020

http://i32.photobucket.com/albums/d5...g?t=1286899071


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