[Black_e90]

I'm assuming it's a leak but is this normal? It's not horribly bad you can see some greasy stuff on and around the cap. Do I need to replace like a o ring or something?

[TheBigYahi]

It's probably the O-Ring. I just bought a whole new cap and it's been clean for a year now.

[Black_e90]

Originally Posted by TheBigYahi

It's probably the O-Ring. I just bought a whole new cap and it's been clean for a year now.

Thanks mate! Where did you get your o ring? And do I need to replace the whole cap or just the ring?

[Squark]

I think it's normal. There's a vent hole near the top of the cap that can seep some fluid. My 328i and my wife's X3 both had some gunk around the cap. I just wipe it down occasionally. It's never enough to drip.

[TheBigYahi]

I bought the whole cap, which I believe came with the O-Ring. https://www.ecstuning.com/ES2503542/

[tc535i]

Originally Posted by Squark

I think it's normal. There's a vent hole near the top of the cap that can seep some fluid. My 328i and my wife's X3 both had some gunk around the cap. I just wipe it down occasionally. It's never enough to drip.

Yup. I've seen a system explode on a track car when the vent got plugged. Totally normal, and necessary. Just wipe it down occasionally.

[e90ca]

Originally Posted by Black_e90

I'm assuming it's a leak but is this normal? It's not horribly bad you can see some greasy stuff on and around the cap. Do I need to replace like a o ring or something?

Mine is also starting to do this too. Did replacing the cap solve the issue you were having?

[Sgop335]

Yes i replaced the o ring and its dry.

[Meeni]

Yes the o-ring gets old and leaks, replace it evey 60k miles I'd say.

[Wolf 335]

Called The bmw dealership today and asked how much the rubber O-ring is...

Magic number is $18 for a goddamn piece of rubber that costs less than a dollar to make.

I don't know how these guys sleep at night knowing they are robbing people with 1800% markup

[tc535i]

Originally Posted by Wolf 335

Called The bmw dealership today and asked how much the rubber O-ring is...

Magic number is $18 for a goddamn piece of rubber that costs less than a dollar to make.

I don't know how these guys sleep at night knowing they are robbing people with 1800% markup

I'm guessing he quoted you the wrong part

realoem shows it at $2.38 usd

http://www.realoem.com/bmw/enUS/show...diagId=32_1641

12 Gasket ring 1 32411128333 $2.38

[Black_e90]

Originally Posted by e90ca

Mine is also starting to do this too. Did replacing the cap solve the issue you were having?

Lol haven't got to it yet...

[Black_e90]

Originally Posted by tc535i

I'm guessing he quoted you the wrong part

realoem shows it at $2.38 usd

http://www.realoem.com/bmw/enUS/show...diagId=32_1641

12 Gasket ring 1 32411128333 $2.38

Thanks for that link

[Wolf 335]

Originally Posted by tc535i

I'm guessing he quoted you the wrong part

realoem shows it at $2.38 usd

http://www.realoem.com/bmw/enUS/show...diagId=32_1641

#12. Gasket ring 1 32411128333 $2.38

Just called them again and gave them the part number and yup

$16.00+tax= $18.02 bravo bmw, bravo

[Meeni]

Lol they crazy, I bought mine from Bavauto for $3 or so.

[Efthreeoh]

Originally Posted by Wolf 335

Just called them again and gave them the part number and yup

$16.00+tax= $18.02 bravo bmw, bravo

The TradeMotion parts dealership I use has P/N 32411128333 for $4.50. That said, I'd just take the O-ring up to a auto parts store and match it up. 'Taint no magic to it.

[bantam]

Originally Posted by Efthreeoh

The TradeMotion parts dealership I use has P/N 32411128333 for $4.50. That said, I'd just take the O-ring up to a auto parts store and match it up. 'Taint no magic to it.

I just did this at my local Ace hardware store, cost was $0.99

Easiest thing is to take in the cap itself, you may not find a perfect match for gland thickness and diameter, but you can find one that fits the cap. I would not say that OEM sizing is particularly critical in this application. Based on my experience with this and a separate water coolant fitting, BMWs O-ring groove designs aren't amazing.

I think that I used the size 129 from the AS568 standard selection.

[Efthreeoh]

Originally Posted by tharptroy

I just did this at my local Ace hardware store, cost was $0.99

Easiest thing is to take in the cap itself, you may not find a perfect match for gland thickness and diameter, but you can find one that fits the cap. I would not say that OEM sizing is particularly critical in this application. Based on my experience with this and a separate water coolant fitting, BMWs O-ring groove designs aren't amazing.

I think that I used the size 129 from the AS568 standard selection.

Not to one-up you , but a few weeks ago I noticed more gunk than usual around my PS oil cap. I just took the o-ring off and flipped it over. I just checked Monday night at the gas station and the reservoir is as clean as a whistle, and since I drive about 500 miles a week in the E90 now (down from 800), it's been probably 1,200 miles since I flipped the o-ring.

[e90ca]

What happens if you put in a new o-ring and you still get a leak?

What else could it be at this point? A few local shops have suggested it may be the crush washers need to be replaced on the lines?

[Wolf 335]

Originally Posted by e90ca

What happens if you put in a new o-ring and you still get a leak?

What else could it be at this point? A few local shops have suggested it may be the crush washers need to be replaced on the lines?

New o ring does not prevent the gunk from forming. The cap is designed to vent. There is a hole on it.

[PhaseP]

It does prevent.

[TheMidnightNarwhal]

Just wanted to chime in as I found this thread from searching as I also noticed I had leaking and gunk issue even though I replaced the reservoir with cap 25 000KM ago. Guess it's normal.