What is this leak?

TZ · 09-01-2018, 09:09 PM

Today I removed the underneath engine cover and found a sign of leak (Picture 1) . Trace it down and found the stain on the lower part of the coolant hose from the bottom (Picture 2). There is also light stain can be seen from the top on the coolant hose (Picture 3). The leak is hard to tell oil or coolant fluid. I carefully checked around and could not find the source. it is not the famous oil cooling housing (Picture 4)

What it would be?

BurrNinja · 09-02-2018, 10:42 AM

Quote:

Originally Posted by TZ

Today I removed the underneath engine cover and found a sign of leak (Picture 1) . Trace it down and found the stain on the lower part of the coolant hose from the bottom (Picture 2). There is also light stain can be seen from the top on the coolant hose (Picture 3). The leak is hard to tell oil or coolant fluid. I carefully checked around and could not find the source. it is not the famous oil cooling housing (Picture 4)

What it would be?

Possible ofhg? Looks a bit grimy on the last picture near filter area on left side? thats my assumption. Have you taken engine cover off and checked around valve cover gasket also?

NinetyEight740 · 09-02-2018, 03:56 PM

Is it engine oil? Could be the seal on your intercooler piping allowing small amount of oil and air to escape.

tcabill · 09-03-2018, 06:45 AM

Looks like oil filter housing to me.

TZ · 09-03-2018, 09:49 PM

Quote:

Originally Posted by bill85208

Looks like oil filter housing to me.

The oil filter housing is clean (picture 4).

I cleaned them up and will take a good look next time.

paul223 · 09-09-2018, 09:33 AM

Intercooler connection on turbo side.

09-01-2018, 09:09 PM	#1
TZ Second Lieutenant 51 Rep 228 Posts Drives: 2011 535i xDrive, 2014 435i CO Join Date: Mar 2015 Location: NJ iTrader: (0)	What is this leak? Today I removed the underneath engine cover and found a sign of leak (Picture 1) . Trace it down and found the stain on the lower part of the coolant hose from the bottom (Picture 2). There is also light stain can be seen from the top on the coolant hose (Picture 3). The leak is hard to tell oil or coolant fluid. I carefully checked around and could not find the source. it is not the famous oil cooling housing (Picture 4) What it would be? Attached Images __________________ 2011 535i xDrive Black/Black, Michelin PS AS 4 2014 435i RWD Convertible Service Manual: www.newtis.info Part: http://www.realoem.com
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09-02-2018, 03:56 PM	#3
NinetyEight740 Major General 231 Rep 5,691 Posts Drives: 2 - 2013 535i msport Join Date: Nov 2008 Location: Orange County California iTrader: (2) Garage List 2010 E91 [0.00]	Is it engine oil? Could be the seal on your intercooler piping allowing small amount of oil and air to escape.
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09-03-2018, 06:45 AM	#4
tcabill Private 14 Rep 51 Posts Drives: e63 650i, F10 535i, E93 335i Join Date: Jan 2013 Location: San Diego, CA iTrader: (0) Garage List 2012 BMW F10 N55 PWG [0.00]	Looks like oil filter housing to me.
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09-09-2018, 09:33 AM	#6
paul223 Major 411 Rep 1,126 Posts Drives: F10 Join Date: Dec 2013 Location: arkansas iTrader: (0)	Intercooler connection on turbo side.
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