Oil leak near the blow off valve? - BMW 3-Series (E90 E92) Forum

timo1980 · 12-10-2012, 01:57 PM

Hi, it looks like one of the connections near the blow off valve is leaking oil, and I'm wondering if that's normal. It's not a huge leak, since I only have to add about half a quart between oil changes. Is this due to blow by, or is there something wrong with my car? I tried to take a picture:

E90Company · 12-10-2012, 03:19 PM

I don't see any oil?

benzy89 · 12-10-2012, 04:00 PM

I don't see a BOV (just the OEM DVs) or any oil?

timo1980 · 12-10-2012, 04:04 PM

The dirt near the gray connector on the diverter pipe, underneath the blow off valve looking thing looks like oil to me, but maybe I'm wrong?

TheeGovernor · 12-10-2012, 06:47 PM

I think he is talking about near the brake booster line. That oil is just seepage from the blow by vapors of the crankcase.

ign335i · 12-10-2012, 08:43 PM

My dv leaks a bit there. I am interested. How do you stop it?

JamesM3M5 · 12-11-2012, 05:02 PM

Need a new o-ring in the chargepipe. I pulled them out to measure and ordered ones that were a tiny bit fatter, but I can't remember what size. They are not available from BMW separately. I ordered a bag of them from McMaster-Carr.

It could also be oil from an oil filter housing leak making its way down there, but that usually cakes dirt on the front of the motor.

ign335i · 12-11-2012, 06:40 PM

Quote:

Originally Posted by JamesM3M5

Need a new o-ring in the chargepipe. I pulled them out to measure and ordered ones that were a tiny bit fatter, but I can't remember what size. They are not available from BMW separately. I ordered a bag of them from McMaster-Carr.

It could also be oil from an oil filter housing leak making its way down there, but that usually cakes dirt on the front of the motor.

Anyway you could try and dig up the PN? When you say a little bit fatter, is that around 1/16" in cross sectional diameter or not even that much?

JamesM3M5 · 12-11-2012, 10:00 PM

Quote:

Originally Posted by ign335i

Anyway you could try and dig up the PN? When you say a little bit fatter, is that around 1/16" in cross sectional diameter or not even that much?

I can do that. I have my stock CP to dig out the o-ring and take a measurement. The factory ring is an odd-sized metric and I think there was a regular metric ring that was a tiny bit fatter.

12-10-2012, 01:57 PM	#1
timo1980 Private Drives: 135i Join Date: Sep 2010 Location: santa clara, ca Posts: 84 iTrader: (1)	Oil leak near the blow off valve? Hi, it looks like one of the connections near the blow off valve is leaking oil, and I'm wondering if that's normal. It's not a huge leak, since I only have to add about half a quart between oil changes. Is this due to blow by, or is there something wrong with my car? I tried to take a picture: Attached Images
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12-11-2012, 05:02 PM	#7
JamesM3M5 Some dude Drives: E28 M5, E92 335i Join Date: Sep 2011 Location: Northern VA Posts: 1,569 iTrader: (0)	Need a new o-ring in the chargepipe. I pulled them out to measure and ordered ones that were a tiny bit fatter, but I can't remember what size. They are not available from BMW separately. I ordered a bag of them from McMaster-Carr. It could also be oil from an oil filter housing leak making its way down there, but that usually cakes dirt on the front of the motor. __________________ RRT Racing E92 335i/6MT Dinan Stage 3 intercooler, oil cooler, intake, flash. E28 M5, R171 SLK350

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12-10-2012, 03:19 PM	#2
E90Company Major General Drives: 335i Join Date: Mar 2012 Location: SFL Posts: 5,549 iTrader: (2)	I don't see any oil?

12-10-2012, 04:00 PM	#3
benzy89 Banned Drives: '08 E90 335i Join Date: Jan 2012 Location: Northern NJ Posts: 2,400 iTrader: (3) Garage List 2008 BMW 335i [3.75]	I don't see a BOV (just the OEM DVs) or any oil?

12-10-2012, 04:04 PM	#4
timo1980 Private Drives: 135i Join Date: Sep 2010 Location: santa clara, ca Posts: 84 iTrader: (1)	The dirt near the gray connector on the diverter pipe, underneath the blow off valve looking thing looks like oil to me, but maybe I'm wrong?

12-10-2012, 06:47 PM	#5
TheeGovernor Private First Class Drives: --->Like that unfortunately Join Date: Dec 2011 Location: Mile High Posts: 117 iTrader: (1) Garage List 2007 BMW 335i [0.00]	I think he is talking about near the brake booster line. That oil is just seepage from the blow by vapors of the crankcase.

12-10-2012, 08:43 PM	#6
ign335i Second Lieutenant Drives: 335i e92 Join Date: Nov 2012 Location: CA Posts: 242 iTrader: (1)	My dv leaks a bit there. I am interested. How do you stop it?