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Old 05-26-2010, 10:30 AM   #1
Vlad
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Default Oil pans, 2.0 vs 2.5

So, as in the title, I would like to acquire as much info as possible about how the oil pans compare.
I have a 2.0 with an old and not so flat at the bottom pan.
I am looking at either replacing this with a new OEM 2.0 pan (or slightly used) or a 2.5 pan.
What I've been able to read so far is that:
1) the 2.0 pan has more oil holding cappacity. Is this true?
2) the 2.5 pan has better baffling so that it can retain the oil at the pump inlet. True?

I need to know also, what else goes with the 2.5 pan, new dipstick?

Also, once the pan is out for replacement, do you get direct access to replacing the oil pump?
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Old 05-26-2010, 11:04 AM   #2
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you'll need a new dipstick and oil pick up
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Old 05-26-2010, 11:23 AM   #3
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For the oil pump you have to take off the timing belt to get access to it. It is directly behind the crank pulley.

You will have access to the oil pick-up tube when you remove the pan.
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Old 05-26-2010, 12:11 PM   #4
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1) NO they have the same capacity according to the owners manual
2) YES better baffling inside the pan as well as the baffle tray attached to the engine above the pan. Plus if you want to use equal length headers the pan must be changed.
I just did this job with a used first gen 04 pan. They say the second gen pans are better but mine was way cheap.
I changed the pan, baffle tray, dipstick, tube(not needed), and oil pickup. I used Permatex copper sealant putting it back together with no leaks.
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Old 05-26-2010, 12:13 PM   #5
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Quote:
Originally Posted by Vlad View Post
So, as in the title, I would like to acquire as much info as possible about how the oil pans compare.
I have a 2.0 with an old and not so flat at the bottom pan.
I am looking at either replacing this with a new OEM 2.0 pan (or slightly used) or a 2.5 pan.
What I've been able to read so far is that:
1) the 2.0 pan has more oil holding cappacity. Is this true? Overall volume is similar, only the configuration of the pans is different to prevent the oil from sloshing away from the pickup during hard cornering
2) the 2.5 pan has better baffling so that it can retain the oil at the pump inlet. True? Yes & No, the STI oil baffle tray is at the top of the Pan/bottom of the block, beneath the rods, and is a separate piece. It does not come with the pan. I had to order mine separately. The pan configuration is different and there is some difference in baffling of the pan (See above comment).

I need to know also, what else goes with the 2.5 pan, new dipstick?
Yes, the dipsticks are different lengths & PN's. I believe because the STI pan is slightly deeper.

Also, once the pan is out for replacement, do you get direct access to replacing the oil pump?
NO, the oil pump is on the front of your engine, not the bottom, which is why many change the oil pump / water pump when they do the timing belt because you have to pull the belt for removal.[/quote]
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Old 05-26-2010, 12:39 PM   #6
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once you have the pan off, do yourself a favor and get a KillerB Motorsport ultimate oil pickup. nice piece of insurance
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Old 05-26-2010, 01:43 PM   #7
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Ok, good stuff guys.
I'm surprised the baffling sits to high up, yet it's efficient.

So I need:
-oil pan
-oil pan gasket (or is the OEM permatex?)
-dipstick
-oil pickup
-oil baffle tray

And this has the potential to prevent oil starvation.
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Old 05-26-2010, 01:49 PM   #8
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IIRC, there is no actual oil pan gasket, just use high temp RTV.
fujibond, hondabond, threebond, permatex, whatever you like best.

Watch the torque on those bolts, spec is VERY low, like 2-3 ft/lbs. Too much and you'll warp the sealing surface.
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Old 05-26-2010, 01:54 PM   #9
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Thank you.

Any more information about the second generation oil pans? Maybe a way to spot the difference, maybe a part number?
What's a good price on a new pan?
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Old 05-26-2010, 02:14 PM   #10
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go to one of the online parts places like
http://www.chaplinssubarugenuineparts.com/
http://www.subaruparts.com/
http://www.subaruwrxpartscom/
etc...

they'll have listings that can usually be deciphered. You want 06+ WRX and STi are the same. More info in this thread:
http://forums.nasioc.com/forums/show....php?t=1756427

Pictures on post 36.

I think there are part numbers in there too, but not sure.
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Old 05-26-2010, 05:17 PM   #11
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Quote:
Originally Posted by prometheum View Post
you'll need a new dipstick and oil pick up
No he won't.

I used my EJ205 oil pan on my EJ257 block and didn't have to get anything new.

There is no gasket for the oil pan -- you need gasket sealer.
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Old 05-26-2010, 05:50 PM   #12
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Quote:
Originally Posted by Ryan314 View Post
No he won't.

I used my EJ205 oil pan on my EJ257 block and didn't have to get anything new.
This has zero relevance, to the topic. He isn't talking about an EJ205 oil pan on an EJ257 block... he's talking about a 2.5L oil pan on an EJ205 block.
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Old 05-26-2010, 06:33 PM   #13
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Thanks again, I'm reading all this good info.
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Old 05-26-2010, 08:05 PM   #14
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The dipsticks ARE different...
Don't believe me, ask Jamie (SubieGal) @ Subarugenuineparts.com
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Old 05-26-2010, 08:38 PM   #15
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Read THIS




You need to change, pan, pickup, oil control tray (baffle that bolts to the bottom of the pan), dipstick tube and dipstick.

I highly recommend changing the OEM pickup. See failures HERE and HERE.

.

Last edited by KillerBMotorsport; 05-26-2010 at 08:47 PM.
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Old 05-26-2010, 08:48 PM   #16
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Nice read, KB, how did you come to the conclusion that the factory's efforts were geared towards faster drainage of the oil to the bottom of the pan?
Also, very nice piece your oil pick-up.
Why not a flatter angle to the pick-up face? the dent protection feature seems to require a higher minimum oil level before air ingestion begins.
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Old 05-26-2010, 09:37 PM   #17
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Thanks! I first read about it in the european forums, since they've had turbo Imprezas for 10 more years than us over here, it's a great place to collect research data. What people were saying made sense and once i got my hands on a few OEM pans it seemed pretty obvious that the flat bottom pans (EJ20) had limitations from a performance standpoint, and why.

The angle of the sides is much less of an issue when you tip the pan as it would be loaded in a corner. If you're on a flat and your level it that low, that the angle matters, you've got other problems LOL.

The steeper the sides the less likely the pan will form around it, if the pan is bottomed out. A flat bottom pickup it bad. With a big enough bash even low angled sides can have the pan formed around it some.
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Old 05-26-2010, 11:28 PM   #18
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How much clearance is there internally in the 2.0 oil pan for the pick-up? For instance, in your thread, the 2.0 pan shown should be considered out of service because it's slightly concave?
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Old 05-27-2010, 08:10 AM   #19
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I don't recall what the 2.0 clearance was, I wasnt to say ~.125 For comparison the 04-05 EJ25 pan/pickup clearance is 0-.13" (it's common for them to rub the bottom of the pan), and 06+ pan/pickup clearance is .62-.75"

The 2.0 pan in the picture isn't damages except for some dings from hammering it off the block. The bottom is flat, the picture just funny.
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Old 05-27-2010, 10:03 AM   #20
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Thanks again. Wow 3 mm, not much.
I think my front enf was jacked or supported from the oil pan at one point. This was done with care though.
There is no dent, but the whole bottom of the pan seems vaguely concave.
Then again, looking at the photos that you posted, it's normal, it seems, for the 2.0 pan to look concave, when you view it from the side of the drainplug.
I'll post a photo, let's see what people think.
I'm monitoring oil pressure, it's 25-26 PSI in hottest idle and 80-82 around 3500 RPM.
I'm getting ready for track days.
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Old 05-28-2010, 08:37 AM   #21
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Quote:
Originally Posted by skimobile View Post
The dipsticks ARE different...
Don't believe me, ask Jamie (SubieGal) @ Subarugenuineparts.com
They are. I had them side to side and the STi is shorter.
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