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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: Air Filter Replacement - 325 (2.5litre)



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DIY: Air Filter Replacement - 325 (2.5litre)
Published by nexus66
09-06-2005
DIY: Air Filter Replacement - 325 (2.5litre)

For this the only tool you'll need is a T-25 Torx screwdriver.

Firstly, slacken all the screws shown in the first picture. Then lifting the air filter cover you will see that the pipe from just above the kidney grill joins this cover and is secured by two little tabs. By lifting the cover at an angle the tabs should release allowing you to remove the cover completely. Note that the screws do not unscrew fully and stay captive within the cover.

You can now see the air filter element. I was surprised to find a cylindrical filter!! In order to remove the air filter element there is a small clip at the front (circled in picture 3 and close up in picture 4). You need to press the circular area on either side and slide the filter forward. It will then come up and away from its mount.

There is an insert within the filter which is fixed and sealed in place.

Put the new filter in the same way the original was removed, replace the cover making sure the tabs lock into the inlet pipe and the screws all line up. Retighten the screws and you're done!
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  #1  
By E90Fleet on 09-06-2005, 02:26 PM
Please note the USA version uses a different airbox and filter (normal flat filter)
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  #2  
By nexus66 on 09-06-2005, 03:08 PM
I kinda guessed it'd be different for the USA 325, but what filter does the 330 use?
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  #3  
By BMW0 on 12-03-2005, 06:50 AM
The round filter element looked aftermarketly cool though.
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  #4  
By krndanic307 on 12-03-2005, 04:22 PM
Is that for the E46? because the the E90 325 its a 3.0L
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  #5  
By GuillaumeSoete on 12-04-2005, 04:48 AM
Quote:
Originally Posted by krndanic307
Is that for the E46? because the the E90 325 its a 3.0L
The E90 325i uses a 2,497 ccm engine ...

Quoted from bwm.com:


No. of cylinders/valves per cyl. 6/4

Displacement acc. to ECE Reg. in ccm 2,497

Stroke/Bore in mm 78.8/82.0

Nominal power (kW) at 1/min 160/6,500

Max. torque (Nm) at 1/min 250/2,750-4,250


Guillaume
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  #6  
By E90Fleet on 12-04-2005, 09:14 AM
Quote:
Originally Posted by krndanic307
Is that for the E46? because the the E90 325 its a 3.0L
only a 3.0 in the USA

its a 2.5L in the rest of the world, with the same power and torque
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  #7  
By GuillaumeSoete on 12-04-2005, 01:11 PM
Does anyone know what's the reason of that? Is it also a pollution matter? If I remember well, the S50 engines were'nt allowed in the US because of that...

Guillaume
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  #8  
By Daddu on 12-31-2005, 01:38 PM
Can someone post a DIY on removal of the USA 3.0 liter 325i air filter. This is the flat, trapezoidal one.
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  #9  
By WallyF on 12-31-2005, 03:27 PM
US Air Filter

I took my air filter apart to see how hard it would be. Be sure to have a 10 mm socket, a T25 torque bit and flat blade screw driver.

1) Loosen the steel clamp on the output side of the filter housing using the screw driver. Jpg #1

2) Disconnect the connect from the air mass flow meter. JPG 2

3) Disconnect the filter housing from the suction hood intake duct. JPG 3

4) Remove the filter housing from the engine compartment using a 10mm socket two places. Be careful of the air mass flow meter as it is very expensive. JPG 4

5) Remove the screws using the T25 torque bit. JPG 5.

6) Remove air filter and install new filter.

7) Reassemble the air filter housing.

8) Reinstall in engine compartment.
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Last edited by WallyF; 12-31-2005 at 03:49 PM. Reason: Adding 5th picture and additional instructions
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  #10  
By BeemMeUp on 12-31-2005, 03:59 PM
Thanks WallyF for sharing the info. It looks like some work just to change an air filter. I wish BMW would have made it a little easier...
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  #11  
By WallyF on 12-31-2005, 04:21 PM
BeemMeUp,

It takes about 15 minutes to change out the air filter. I figure I will do it between 25,000 and 30,000 miles myself. The dealer will change it out at Inspection #2. I figure that will be at the end of the 4th year or 50,000 miles.

Have a Happy New Year!!

Wallyf :rocks:
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  #12  
By mros47 on 06-23-2006, 01:02 AM
someone knows how can I change the air filter on a bmw 320d e90, thanks
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  #13  
By kfc390 on 01-22-2009, 01:22 PM
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Thanks again for the US instructions

Not to hard but could be better.

Does anyone know why BMW put the second filter in the E90 box? It looks like a furnace filter.
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  #14  
By MainDeck on 02-21-2011, 03:34 PM
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That's a pretty good walk-through. Cut up your steps a little bit more. Still, it's good to know this stuff. I'd like to start doing more basic stuff on my car, without taking it to my dad or the dealer.
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Last edited by MainDeck; 04-22-2012 at 07:49 PM.
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  #15  
By sd23 on 02-26-2011, 02:32 PM
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Thanks for the guide. Helped me perform my tune up.
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  #16  
By 73tnh on 03-06-2011, 09:38 PM
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more pics for the thread... I did mine again today..
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  #17  
By 73tnh on 03-06-2011, 09:50 PM
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my old filter after 8500 miles ..... I am charcoal filter delete also.
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  #18  
By billywu04 on 03-25-2011, 01:24 AM
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I just bought my first bimmer last week, a 2008 328i (black/black, premium, sport). I worked on it for the first time yesterday and installed a matte black grille, and a K&N air filter. I'll post to another thread about my anguish with the grille, but the air filter replacement was surprisingly easy. I took my time, and stopped to snap a bunch of pics along the way, and it took just under 30 minutes. I'll post again with some detailed photos and instructions.

Take it from a newbie, as long as you're careful, you've got almost no reason to be nervous about changing the air filter yourself.

Thanks for the original post, WallyF. It helped a ton!
Last edited by billywu04; 03-25-2011 at 01:27 AM. Reason: update text
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  #19  
By Staticians on 04-12-2011, 03:17 PM
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I put my K&N air filter the engine sound and performance have huge difference. The car runs better and the engine is louder like an sport car supposed to be. It was a great investment!!
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  #20  
By carlosalbertogui on 04-21-2011, 05:38 AM
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dont belive in louder or better performance is exactly the same no diferences

HOTROD182 says

I made a bunch of runs switching the K&N in and out, noticed no difference whatsoever. Infact, my best trap was with the stock air filter. My 12.13 at the drag strip was with a totally stock air filter as well. But let me know if you want to buy my near new K&N, still in the orig box. I only used it a few hours.

But in all fairness, its not really the fault of the K&N. There have been numerous dyno tests showing almost no difference between running a filter and no filter at all.
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  #21  
By carlosalbertogui on 04-21-2011, 05:42 AM
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hi again

one thing is true the car will be more procteted with kN Filter

The filter is so much better
but dont buy if you think will improve performance
the only thing it will do its protecting dust from getting in your motor and that is the most important thing
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