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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 05-21-2011, 03:30 AM
bimmerized bimmerized is offline
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Why don't oil filter kits come w/ the small o-rings?

Since the 2 small 0-rings in the oil filter canister should be changed with the filter, per Bentley, why aren't they included in filter kits? Is everyone buying them separately or just not changing them?

I was disapointed when I didn't find them with the filter. My E36 filters contain the one needed. Anyone know the part number for the small 0-rings?

Also, is there a different part number for the air filters w/ or w/o the foam prefilter? If they are the same part number, how do I specify or has the one w/ the prefilter been superceeded?

Thanks.
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  #2  
Old 05-21-2011, 04:07 AM
kmorgan_260 kmorgan_260 is offline
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I have an e36 and an e90 and both of those kits come with all the o-rings, so I can't imagine the e46 wouldn't. Maybe try another source or maybe it was just missing from the one you picked up?
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  #3  
Old 05-21-2011, 05:24 PM
Starless Starless is offline
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The part number (per realoem) for that little o-ring is 11421744001 , the price is $0.88 per o-ring. There are 2 of them.

Per Bently they need to be changed, but per BMW they do not. Bently is a good general reference but there are inaccuracies it it here and there.

I changed mine at around 80K-90K. Might be a good idea to change it again soon. But strictly speaking you do not have to and it'll be just fine.

For the air element, I believe it's one part # 13721744869. If you buy retail, just ask for the one with foam prefilter, if buying online it will be indicated in the item description whether it has prefilter or not.

Last edited by Starless; 05-21-2011 at 05:35 PM.
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  #4  
Old 05-21-2011, 05:37 PM
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Solidjake Solidjake is offline
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The Mann filters I buy come with them.
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  #5  
Old 05-22-2011, 08:33 AM
bimmerized bimmerized is offline
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Quote:
Originally Posted by Starless View Post
The part number (per realoem) for that little o-ring is 11421744001 , the price is $0.88 per o-ring. There are 2 of them.

Per Bently they need to be changed, but per BMW they do not. Bently is a good general reference but there are inaccuracies it it here and there.

I changed mine at around 80K-90K. Might be a good idea to change it again soon. But strictly speaking you do not have to and it'll be just fine.

For the air element, I believe it's one part # 13721744869. If you buy retail, just ask for the one with foam prefilter, if buying online it will be indicated in the item description whether it has prefilter or not.
Thanks Alex! I better order some the next time I get parts. I don't think mine has ever been changed at 140K. Any harm in doing it without changing the filter or the lg o-ring? How do I get/ref the BMW guide, TIS?
Actually I prefer the filter w/o as I don't drive it in dusty areas and it must be freer breathing.

Starless, what is the p/n on your Mann kit? Thanks.
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  #6  
Old 12-15-2013, 06:50 PM
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iskoos iskoos is offline
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What????

Changed my oil 7-8 times so far. The kit I buy (Mann) always comes with both small and large O-rings...
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  #7  
Old 12-15-2013, 07:43 PM
GoForthFast GoForthFast is offline
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Bought virtually every brand filter made for the e46 and never saw the two small O-rings included.
Bought mine from the dealer, who had to special order them because his mechanics never use them.
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  #8  
Old 12-15-2013, 07:54 PM
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iskoos iskoos is offline
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Well, this is funny. Just went to my garage to look at the Mann filter kit and I only saw a large O-ring and a crush washer. Go figure

I could swear that I replaced that little O-ring many times.
Man, did I drink too much today
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  #9  
Old 12-15-2013, 09:22 PM
lgr122 lgr122 is offline
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Here in Europe they come with those small o-rings and even drain plug ring.
Atleast those two brands i've bought, Bosch and M-Filter.

Maybe wouldn't need to replace those rings every time, but when they are right there in box, then i put new ones ofcourse.

Last edited by lgr122; 12-15-2013 at 09:31 PM.
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  #10  
Old 12-16-2013, 04:03 AM
PerfectStorm01 PerfectStorm01 is online now
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Quote:
Originally Posted by GoForthFast View Post
Bought virtually every brand filter made for the e46 and never saw the two small O-rings included.
Bought mine from the dealer, who had to special order them because his mechanics never use them.
Same with me. Should we replace it as part of a 100k maintenance program?
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  #11  
Old 12-16-2013, 05:44 AM
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ahull ahull is online now
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Originally Posted by PerfectStorm01 View Post
Same with me. Should we replace it as part of a 100k maintenance program?
Yeah, I think somewhere up around 100k miles is a good time.
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  #12  
Old 12-16-2013, 07:03 AM
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I've never changed mine. Anyone know what they do?
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  #13  
Old 12-16-2013, 09:27 AM
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jvr826 jvr826 is offline
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I've purchased a pile of Mann filter kits, never came with the small o-ring. Maybe this is why we're all using so much oil. :-)
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  #14  
Old 12-16-2013, 12:38 PM
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smolck smolck is offline
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I've purchased a pile of Mann filter kits, never came with the small o-ring. Maybe this is why we're all using so much oil. :-)


Exactly. But I still wonder what purpose they serve?
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  #15  
Old 12-16-2013, 10:08 PM
GoForthFast GoForthFast is offline
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Originally Posted by smolck View Post


Exactly. But I still wonder what purpose they serve?
I think they isolate the input side of the filter element from the output side of the element. If one was to fail, I believe some oil could bypass the filter.
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