Oil on my cats (need help diagnosing)

CoolGuyNilo · 03-10-2015, 11:26 PM

Hello guys,
My 335i has been smoking out of the hood heavily and if you look down the left part of the engine you can see the top of one of the downpipes is smoking heavily. i know cats dont have oil so something must be leaking on them cauing it to smoke.. any ideas on what it could be.. i was thinking head gasket but i wanted opinions from the pros.

thank you

Miller335 · 03-10-2015, 11:48 PM

Probably leaking where the oil line goes into the turbo connected to that cat.

MilehighM3 · 03-10-2015, 11:52 PM

It's also possible the leak is coming from either the valve cover gasket or the rear turbo inlet pipe seal.

CoolGuyNilo · 03-11-2015, 09:07 AM

Quote:

Originally Posted by MilehighM3

It's also possible the leak is coming from either the valve cover gasket or the rear turbo inlet pipe seal.

yeah i think it might be the valve cover also because it seems to be dripping from the rear wastegate actuator.

bigdaddycane · 03-11-2015, 10:33 AM

Also look at the oil filter/oil cooler unit as it can leak and run down the front of the motor and around to the turbo side of the block.

my guess is the rear turbo seal is leaking (very common, happened to my car).

1MOREMOD · 03-27-2015, 12:10 AM

I oiled my cat but hard to get ahold of after.

fmonteiro444 · 03-27-2015, 11:02 AM

Quote:

Originally Posted by 1MOREMOD

I oiled my cat but hard to get ahold of after.

03-10-2015, 11:26 PM	#1
CoolGuyNilo Enlisted Member 18 Rep 49 Posts Drives: E93 335i - Few bolt ons Join Date: Apr 2013 Location: Homestead - Miami, Florida iTrader: (0) Garage List 2008 BMW 335i [0.00]	Oil on my cats (need help diagnosing) Hello guys, My 335i has been smoking out of the hood heavily and if you look down the left part of the engine you can see the top of one of the downpipes is smoking heavily. i know cats dont have oil so something must be leaking on them cauing it to smoke.. any ideas on what it could be.. i was thinking head gasket but i wanted opinions from the pros. thank you Attached Images
	Appreciate 0 Tweet Quote

03-10-2015, 11:48 PM	#2
Miller335 Colonel 291 Rep 2,189 Posts Drives: 2007 E92 Join Date: Oct 2013 Location: Portland, OR iTrader: (0)	Probably leaking where the oil line goes into the turbo connected to that cat. __________________ 2007 E92 335 6MT w/335is clutch FBO MHD E60 Wedge map 49k miles
	Appreciate 0 Quote

03-10-2015, 11:52 PM	#3
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	It's also possible the leak is coming from either the valve cover gasket or the rear turbo inlet pipe seal.
	Appreciate 0 Quote

03-11-2015, 10:33 AM	#5
bigdaddycane I even mod my cereal 246 Rep 3,441 Posts Drives: 11 ZCP DCT M3 14 328d 21 GT4 Join Date: Aug 2009 Location: Northern Va iTrader: (53) Garage List 2021 Porsche GT4 [0.00] 2014 BMW 328d Xdriv ... [0.00] 2011 BMW M3 [0.00]	Also look at the oil filter/oil cooler unit as it can leak and run down the front of the motor and around to the turbo side of the block. my guess is the rear turbo seal is leaking (very common, happened to my car). __________________ 2011 Mineral White M3 ZCP - Opticoat, Ventureshield, some CF, B&B exhaust, AFE Intake Vorsteiner VFF 101s Ohlins 2014 Mineral White 328d Xdrive Wagon - Opticoat, Ventureshield, B8s, H&R, Apex SM-10s Hawk Pads 2021 718 Cayman GT4 - Fire extinguiser
	Appreciate 0 Quote

03-27-2015, 12:10 AM	#6
1MOREMOD - 11817 Rep 23,187 Posts Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors iTrader: (5)	I oiled my cat but hard to get ahold of after.
	Appreciate 2 Quote