"Blow By" Oil Residue on Power Steering Reservoir

kfrazie1 · 08-03-2012, 06:25 PM

2007 E90 335i
Auto Trans
71,000 miles
No OCC
BMS Dual Cone Intake

I seem to be getting some oil residue being blown onto the power steering reservoir tank on the driver side near intake cones. Trying to figure out where this is coming from. Any ideas? Could it be diverter valves blowing out oil to atmosphere carried over from PCV loop? I'll add a picture.

Keith

gzim335 · 08-03-2012, 06:40 PM

its a small rubber tube thingy on the cap replace n ull be good

kfrazie1 · 08-03-2012, 07:29 PM

Well i dont think its a problem with the reservoir. Its seems like its oil coming from something else.

leebermeister · 08-05-2012, 08:15 AM

Oil filter housing gasket?

EJ_3 · 08-05-2012, 09:43 AM

Sounds like a pinched o ring maybe, check around your oil filter. I had the same problem a few weeks ago.

Surly73 · 08-05-2012, 02:35 PM

I second gzim's initial reaction that it's the PS reservoir leaking. Every BMW I've seen in the last 15 years seems to have (or develop) a leaking PS reservoir. You seem pretty convinced that's not it though - can you supply a pic?

kfrazie1 · 08-07-2012, 07:11 PM

Surly73 · 08-08-2012, 07:48 AM

I still think it's the cap and/or it's coming from that vent hole.

There could be something going on with a blockage of the internal filter, or something else causing the level to be higher than normal.

Try:

- cleaning it up
- replacing the O-Ring
- insert a Q-tip into that vent hole you can see in the cap and break it off so that there's still enough stalk to pull the Q-tip out. This allows it to vent but dramatically reduces the changes of liquid coming out.

From what I see, I don't think this is coming from anywhere else upwind of the reservoir - I see it all the time on BMWs.

raceyBMW · 08-08-2012, 09:28 AM

Looks like a leaky cap o-ring for sure. Make sure also that the PS Fluid level isn't to high (check when engine is warm).

Part #12 here
http://www.realoem.com/bmw/showparts...41&hg=32&fg=20

cvc 22349a · 08-08-2012, 02:41 PM

Quote:

Originally Posted by raceyBMW

Looks like a leaky cap o-ring for sure. Make sure also that the PS Fluid level isn't to high (check when engine is warm).

Part #12 here
http://www.realoem.com/bmw/showparts...41&hg=32&fg=20

+1. Had the same issue and replaced o-ring.

kfrazie1 · 08-08-2012, 06:29 PM

Quote:

Originally Posted by Surly73

I still think it's the cap and/or it's coming from that vent hole.

There could be something going on with a blockage of the internal filter, or something else causing the level to be higher than normal.

Try:

- cleaning it up
- replacing the O-Ring
- insert a Q-tip into that vent hole you can see in the cap and break it off so that there's still enough stalk to pull the Q-tip out. This allows it to vent but dramatically reduces the changes of liquid coming out.

From what I see, I don't think this is coming from anywhere else upwind of the reservoir - I see it all the time on BMWs.

OK, I'll try that and report back.

jalberto · 10-13-2012, 07:02 PM

Did the fix on the power steering cap solve the oil issue? I have the same problem. Tks

J

g9sBMW · 10-15-2012, 11:49 AM

Quote:

Originally Posted by leebermeister

Oil filter housing gasket?

I had the same build up of oil on my power steering reservoir . . . and it was the oill filter housing in my case.

kfrazie1 · 10-20-2012, 03:36 PM

It turned out to be just a loose cap!

abhishriv · 01-09-2013, 10:43 PM

Quote:

Originally Posted by kfrazie1

It turned out to be just a loose cap!

i think i have the same problem, did you change the fluid too?

kfrazie1 · 01-10-2013, 12:12 PM

Not yet, on my list. Its still leaking just a bit.

M5Rlz · 04-06-2013, 10:22 PM

revive. How do you change the O ring?

BillionPa · 04-07-2013, 01:59 AM

cut the old one off with a razor blade, put the new one in its place.

additionally, you will notice there is actually a vent hole in the cap (you can see in the pics above) and oil residue will leak out of that hole, so the o-ring is not always the solution.

My current recommendation is to drain the fluid and replace the entire reservoir every 30000 miles, as it has an integral filter, and you get a new o-ring at the same time.

08-03-2012, 06:25 PM	#1
kfrazie1 Lieutenant 64 Rep 553 Posts Drives: 335i Join Date: Aug 2010 Location: NY iTrader: (4)	"Blow By" Oil Residue on Power Steering Reservoir 2007 E90 335i Auto Trans 71,000 miles No OCC BMS Dual Cone Intake I seem to be getting some oil residue being blown onto the power steering reservoir tank on the driver side near intake cones. Trying to figure out where this is coming from. Any ideas? Could it be diverter valves blowing out oil to atmosphere carried over from PCV loop? I'll add a picture. Keith __________________ Montego Blue E90 335i 7" VRSF IC \| OFT Tune \| DCI \| RB PCV \| Secondary CAT Delete & CYBA 3.75" Tips \| M3 Front \| Mtech Rear \| CSL Trunk \| 219M \| KW V1 \| AA CP
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08-03-2012, 06:40 PM	#2
gzim335 Captain 148 Rep 965 Posts Drives: e92 m3 Join Date: Feb 2011 Location: staten island ny iTrader: (4) Garage List 2007/1 e90 335i [2.00]	its a small rubber tube thingy on the cap replace n ull be good __________________ e92 m3 dct gintani stage 2+ full ethanol custom pulley and meth kw clubsport,ap racing radical,volk te37sl,akrapovic rear,recaro profi xl,voltphreaks battery
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08-03-2012, 07:29 PM	#3
kfrazie1 Lieutenant 64 Rep 553 Posts Drives: 335i Join Date: Aug 2010 Location: NY iTrader: (4)	Well i dont think its a problem with the reservoir. Its seems like its oil coming from something else. __________________ Montego Blue E90 335i 7" VRSF IC \| OFT Tune \| DCI \| RB PCV \| Secondary CAT Delete & CYBA 3.75" Tips \| M3 Front \| Mtech Rear \| CSL Trunk \| 219M \| KW V1 \| AA CP
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08-05-2012, 08:15 AM	#4
leebermeister Enlisted Member 1 Rep 45 Posts Drives: 06 330i Join Date: Jan 2010 Location: TX iTrader: (0)	Oil filter housing gasket? Last edited by leebermeister; 08-07-2012 at 10:09 PM..
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08-05-2012, 09:43 AM	#5
EJ_3 Colonel 371 Rep 2,838 Posts Drives: e92 335i, e34 525i & e60 530i Join Date: Aug 2011 Location: N Las Vegas iTrader: (13) Garage List 2007 BMW 335i [8.34] 2016 Ram 1500 Sport [8.00] 1994 BMW 525i [10.00] 2007 BMW 530i [8.66]	Sounds like a pinched o ring maybe, check around your oil filter. I had the same problem a few weeks ago. __________________ click here for mods
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08-05-2012, 02:35 PM	#6
Surly73 Lieutenant Colonel 535 Rep 1,873 Posts Drives: '11 535xi 8AT KWv3 MPE MHD xHP Join Date: May 2012 Location: Oakville, Ontario iTrader: (1)	I second gzim's initial reaction that it's the PS reservoir leaking. Every BMW I've seen in the last 15 years seems to have (or develop) a leaking PS reservoir. You seem pretty convinced that's not it though - can you supply a pic?
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08-07-2012, 07:11 PM	#7
kfrazie1 Lieutenant 64 Rep 553 Posts Drives: 335i Join Date: Aug 2010 Location: NY iTrader: (4)
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08-08-2012, 07:48 AM	#8
Surly73 Lieutenant Colonel 535 Rep 1,873 Posts Drives: '11 535xi 8AT KWv3 MPE MHD xHP Join Date: May 2012 Location: Oakville, Ontario iTrader: (1)	I still think it's the cap and/or it's coming from that vent hole. There could be something going on with a blockage of the internal filter, or something else causing the level to be higher than normal. Try: - cleaning it up - replacing the O-Ring - insert a Q-tip into that vent hole you can see in the cap and break it off so that there's still enough stalk to pull the Q-tip out. This allows it to vent but dramatically reduces the changes of liquid coming out. From what I see, I don't think this is coming from anywhere else upwind of the reservoir - I see it all the time on BMWs.
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08-08-2012, 09:28 AM	#9
raceyBMW king of the hills 92 Rep 2,915 Posts Drives: 2011 M3 w/ESS55, 2001 540i/6 Join Date: Dec 2006 Location: Arvada, CO iTrader: (1) Garage List 2001 BMW 540i/6 [8.17] 1994 530i [9.00] 2007 335i Coupe [8.37]	Looks like a leaky cap o-ring for sure. Make sure also that the PS Fluid level isn't to high (check when engine is warm). Part #12 here http://www.realoem.com/bmw/showparts...41&hg=32&fg=20
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10-13-2012, 07:02 PM	#12
jalberto Enlisted Member 0 Rep 43 Posts Drives: 335i Join Date: May 2009 Location: PR iTrader: (0)	Did it work? Did the fix on the power steering cap solve the oil issue? I have the same problem. Tks J
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10-20-2012, 03:36 PM	#14
kfrazie1 Lieutenant 64 Rep 553 Posts Drives: 335i Join Date: Aug 2010 Location: NY iTrader: (4)	It turned out to be just a loose cap! __________________ Montego Blue E90 335i 7" VRSF IC \| OFT Tune \| DCI \| RB PCV \| Secondary CAT Delete & CYBA 3.75" Tips \| M3 Front \| Mtech Rear \| CSL Trunk \| 219M \| KW V1 \| AA CP
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01-10-2013, 12:12 PM	#16
kfrazie1 Lieutenant 64 Rep 553 Posts Drives: 335i Join Date: Aug 2010 Location: NY iTrader: (4)	Not yet, on my list. Its still leaking just a bit. __________________ Montego Blue E90 335i 7" VRSF IC \| OFT Tune \| DCI \| RB PCV \| Secondary CAT Delete & CYBA 3.75" Tips \| M3 Front \| Mtech Rear \| CSL Trunk \| 219M \| KW V1 \| AA CP
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04-06-2013, 10:22 PM	#17
M5Rlz Colonel 249 Rep 2,202 Posts Drives: R8, f10m59(Rip), m4, GTR Join Date: Feb 2013 Location: MD iTrader: (3)	revive. How do you change the O ring?
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04-07-2013, 01:59 AM	#18
BillionPa Second Lieutenant 2 Rep 288 Posts Drives: 335i Join Date: Feb 2013 Location: USA iTrader: (0)	cut the old one off with a razor blade, put the new one in its place. additionally, you will notice there is actually a vent hole in the cap (you can see in the pics above) and oil residue will leak out of that hole, so the o-ring is not always the solution. My current recommendation is to drain the fluid and replace the entire reservoir every 30000 miles, as it has an integral filter, and you get a new o-ring at the same time.
	Appreciate 0 Quote