335d engine oil leak?.....

CuntFace5000 · 12-01-2019, 09:23 AM

I noticed a small oil patch on my friends driveway. I looked directly above it and noticed some small drips coming from my car. I have attached some pictures of the area the oil was found and have noticed there is an oil cooler in the vicinity. Has anyone else had a similar issue?

TiredGeek · 12-01-2019, 10:12 AM

There is indeed the engine oil cooler mounted in that area but the problem with modern cars is that there is an undertray for the engine bay which means the oil could be leaking literally anywhere on the engine and finding it's way out there if that is the lowest point when you were parked.
Can you see anything when looking down into the engine bay? You might be able to see the undertray from above....

CuntFace5000 · 12-01-2019, 11:00 AM

Hi thanks, looking down from the top everything looks bone dry. However with the engine being so big there isn't a great deal of space to get a good view.

Wills2 · 12-01-2019, 11:17 AM

I suspect it could be the gearbox....

CuntFace5000 · 12-01-2019, 11:27 AM

Quote:

Originally Posted by Wills2

I suspect it could be the gearbox....

Ah, good one

jackstrath · 12-01-2019, 01:32 PM

Highly doubt it is the gearbox, no where near there. Being a UK car i dont think we got a gearbox oil cooler? There is a slight chance it could be the small oil cooler, hit by a stone/rock and causing the leak? Do the new age 335'd suffer from the red boost pipe seal issue? Quick check would be to take the airbox out and have a look down.

Go's with out saying, keep an eye on the engine oil

bishbosh · 12-01-2019, 01:49 PM

Quote:

Originally Posted by jackstrath

Highly doubt it is the gearbox, no where near there. Being a UK car i dont think we got a gearbox oil cooler? There is a slight chance it could be the small oil cooler, hit by a stone/rock and causing the leak? Do the new age 335'd suffer from the red boost pipe seal issue? Quick check would be to take the airbox out and have a look down.

Go's with out saying, keep an eye on the engine oil

The zf8 gearboxes have an oil cooler. Also the N57 based engines don't suffer from the red boost pipe issues.

jackstrath · 12-01-2019, 02:00 PM

Quote:

Originally Posted by bishbosh

The zf8 gearboxes have an oil cooler. Also the N57 based engines don't suffer from the red boost pipe issues.

yes you are correct but its not a stand alone radiator, its bolted to the side of the engine iirc.

As per my above comment about that rad in the side it should be coolant and not oil so ignore that brain fart moment.

Thewrench86 · 12-01-2019, 02:18 PM

Have a look at the oil filter housing. The rubber seals are common enough to fail on n57 engine

CuntFace5000 · 12-01-2019, 02:44 PM

Quote:

Originally Posted by Thewrench86

Have a look at the oil filter housing. The rubber seals are common enough to fail on n57 engine

Okay thanks I'll check that out along with the other recommendations.

lethbridge · 12-05-2019, 05:56 AM

Certainly on older 35d the hose to the oil cooler is known to weep/fail - I had that at around 100k once...

Assassin · 12-05-2019, 06:42 AM

Coming from that side at the front its almost certain to be the seal on the "red pipe" i.e. the boost pipe from the turbo to the intercooler. Very common for these to leak a little as time goes on and oil to seep down into the plastic undertray and then onto the deck. Not a big or expensive job to rectify, just fiddly due to tight spaces. Have a good look around for videos and relevant posts that will help.

bishbosh · 12-05-2019, 07:59 AM

Quote:

Originally Posted by Assassin

Coming from that side at the front its almost certain to be the seal on the "red pipe" i.e. the boost pipe from the turbo to the intercooler. Very common for these to leak a little as time goes on and oil to seep down into the plastic undertray and then onto the deck. Not a big or expensive job to rectify, just fiddly due to tight spaces. Have a good look around for videos and relevant posts that will help.

I agree it could be the pipe going into the intercooler.

But the 'red pipe' was on the M57 engined E9x

CuntFace5000 · 12-06-2019, 03:21 AM

Quote:

Originally Posted by Assassin

Coming from that side at the front its almost certain to be the seal on the "red pipe" i.e. the boost pipe from the turbo to the intercooler. Very common for these to leak a little as time goes on and oil to seep down into the plastic undertray and then onto the deck. Not a big or expensive job to rectify, just fiddly due to tight spaces. Have a good look around for videos and relevant posts that will help.

Ok thanks

CuntFace5000 · 12-06-2019, 03:24 AM

Quote:

Originally Posted by bishbosh

Quote:

Originally Posted by Assassin

Coming from that side at the front its almost certain to be the seal on the "red pipe" i.e. the boost pipe from the turbo to the intercooler. Very common for these to leak a little as time goes on and oil to seep down into the plastic undertray and then onto the deck. Not a big or expensive job to rectify, just fiddly due to tight spaces. Have a good look around for videos and relevant posts that will help.

I agree it could be the pipe going into the intercooler.

But the 'red pipe' was on the M57 engined E9x

This only seems to have materialised since I had it remapped. Which would tally up with an increase in boost pressure. But how does that affect oil pressure?

I need to get it checked out while it's still under warranty.

CuntFace5000 · 12-06-2019, 03:27 AM

Quote:

Originally Posted by demc1982

Quote:

Originally Posted by bishbosh

Quote:

Originally Posted by Assassin

Coming from that side at the front its almost certain to be the seal on the "red pipe" i.e. the boost pipe from the turbo to the intercooler. Very common for these to leak a little as time goes on and oil to seep down into the plastic undertray and then onto the deck. Not a big or expensive job to rectify, just fiddly due to tight spaces. Have a good look around for videos and relevant posts that will help.

I agree it could be the pipe going into the intercooler.

But the 'red pipe' was on the M57 engined E9x

This only seems to have materialised since I had it remapped. Which would tally up with an increase in boost pressure. But how does that affect oil pressure?

I need to get it checked out while it's still under warranty.

M57 engine? It has been a while since I owned a BMW worth knowing what the engine code was. Can someone please tell me what my engine code is? It is an f30 335d 2017

CuntFace5000 · 12-06-2019, 03:28 AM

Quote:

Originally Posted by bishbosh

Quote:

Originally Posted by Assassin

Coming from that side at the front its almost certain to be the seal on the "red pipe" i.e. the boost pipe from the turbo to the intercooler. Very common for these to leak a little as time goes on and oil to seep down into the plastic undertray and then onto the deck. Not a big or expensive job to rectify, just fiddly due to tight spaces. Have a good look around for videos and relevant posts that will help.

I agree it could be the pipe going into the intercooler.

But the 'red pipe' was on the M57 engined E9x

Surely no pipe going to the intercooler should contain oil?

CuntFace5000 · 12-06-2019, 03:43 AM

Car has only done 24k miles. Remapped at 23k.

bishbosh · 12-06-2019, 04:01 AM

Engine code is N57D30T1

The intercooler will contain oil from the oil vapours coming from the CCV - crankcase ventilation, there is a pipe going from the rocker cover to the main intake pipe between the maf/airbox and turbo. The turbo draws a combination of fresh air and this vapour.

TiredGeek · 12-08-2019, 02:53 PM

Quote:

Originally Posted by bishbosh

Engine code is N57D30T1

The intercooler will contain oil from the oil vapours coming from the CCV - crankcase ventilation, there is a pipe going from the rocker cover to the main intake pipe between the maf/airbox and turbo. The turbo draws a combination of fresh air and this vapour.

……….which then condenses in the intercooler and runs to the lowest point, if there's a slight leak in a pipe joint the oil then get's pushed out of that.

BTW, if the oil is black it's engine, if it's red then either power steering or gearbox.

Ajs_435d · 12-08-2019, 04:20 PM

Oil could come from the turbo bearings and such like as they age.

Watsey · 12-08-2019, 04:49 PM

Quote:

Originally Posted by bishbosh

Engine code is N57D30T1

The intercooler will contain oil from the oil vapours coming from the CCV - crankcase ventilation, there is a pipe going from the rocker cover to the main intake pipe between the maf/airbox and turbo. The turbo draws a combination of fresh air and this vapour.

I had the IC removed from my 30d at 80K miles when the inlet ports were walnut blasted. It was completely clean - no oil residues. Very unlikely to Best regards the source of the oil lean in the OP's car.

The turbo doesn't draw air from the IC. The IC is downstream of the turbo and cools charge air after it's been pressurised.

12-01-2019, 09:23 AM	#1
CuntFace5000 Banned 53 Rep 251 Posts Drives: 335d Join Date: Nov 2019 Location: England, Essex iTrader: (0)	335d engine oil leak?..... I noticed a small oil patch on my friends driveway. I looked directly above it and noticed some small drips coming from my car. I have attached some pictures of the area the oil was found and have noticed there is an oil cooler in the vicinity. Has anyone else had a similar issue? Attached Images
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12-01-2019, 10:12 AM	#2
TiredGeek Old Fart 361 Rep 694 Posts Drives: 335dx F31 Shadow EB Join Date: May 2018 Location: Leeds & Strathnaver iTrader: (0)	There is indeed the engine oil cooler mounted in that area but the problem with modern cars is that there is an undertray for the engine bay which means the oil could be leaking literally anywhere on the engine and finding it's way out there if that is the lowest point when you were parked. Can you see anything when looking down into the engine bay? You might be able to see the undertray from above.... __________________ The doctors said it's OK to listen to the voices..... just don't do what they tell me
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12-01-2019, 11:00 AM	#3
CuntFace5000 Banned 53 Rep 251 Posts Drives: 335d Join Date: Nov 2019 Location: England, Essex iTrader: (0)	Hi thanks, looking down from the top everything looks bone dry. However with the engine being so big there isn't a great deal of space to get a good view.
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12-01-2019, 11:17 AM	#4
Wills2 Barge driver 8658 Rep 12,425 Posts Drives: 730d Join Date: Aug 2014 Location: UK iTrader: (0)	I suspect it could be the gearbox.... __________________ 730d/Z4C
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12-01-2019, 01:32 PM	#6
jackstrath Major 659 Rep 1,239 Posts Drives: 16' F31 340i & 03' Focus RS Join Date: Aug 2014 Location: Aberdeen iTrader: (0)	Highly doubt it is the gearbox, no where near there. Being a UK car i dont think we got a gearbox oil cooler? There is a slight chance it could be the small oil cooler, hit by a stone/rock and causing the leak? Do the new age 335'd suffer from the red boost pipe seal issue? Quick check would be to take the airbox out and have a look down. Go's with out saying, keep an eye on the engine oil
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12-01-2019, 02:18 PM	#9
Thewrench86 Second Lieutenant 36 Rep 286 Posts Drives: E92 \M sport. F06 640d M Sport Join Date: Oct 2011 Location: Uk iTrader: (0)	Have a look at the oil filter housing. The rubber seals are common enough to fail on n57 engine
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12-05-2019, 05:56 AM	#11
lethbridge Captain 470 Rep 786 Posts Drives: 2018 F80 M3 CP YMB Join Date: Feb 2012 Location: United Kingdom iTrader: (0) Garage List 2018 BMW M3 CP [10.00]	Certainly on older 35d the hose to the oil cooler is known to weep/fail - I had that at around 100k once... __________________ Current: 2018 F80 M3CP YMB. Previous: 2015: F34 335d GT M Sport+; 2012: F07 535d GT M Sport; 2008: 335d SE; 2005: 530d; 2003: 330d; 2002: 330i; 1999: 523i
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12-05-2019, 06:42 AM	#12
Assassin First Lieutenant 142 Rep 342 Posts Drives: M340d MHT xDrive Join Date: Dec 2018 Location: Scotland iTrader: (0)	Coming from that side at the front its almost certain to be the seal on the "red pipe" i.e. the boost pipe from the turbo to the intercooler. Very common for these to leak a little as time goes on and oil to seep down into the plastic undertray and then onto the deck. Not a big or expensive job to rectify, just fiddly due to tight spaces. Have a good look around for videos and relevant posts that will help.
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12-06-2019, 03:43 AM	#18
CuntFace5000 Banned 53 Rep 251 Posts Drives: 335d Join Date: Nov 2019 Location: England, Essex iTrader: (0)	Car has only done 24k miles. Remapped at 23k.
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12-06-2019, 04:01 AM	#19
bishbosh Lieutenant Colonel 840 Rep 1,993 Posts Drives: F30 335d Join Date: Oct 2013 Location: Sheffield iTrader: (1) Garage List 2014 BMW 335d [0.00]	Engine code is N57D30T1 The intercooler will contain oil from the oil vapours coming from the CCV - crankcase ventilation, there is a pipe going from the rocker cover to the main intake pipe between the maf/airbox and turbo. The turbo draws a combination of fresh air and this vapour. __________________ if I've helped - an Appreciate would be, er, very appreciated!
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12-08-2019, 04:20 PM	#21
Ajs_435d Lieutenant Colonel 355 Rep 1,846 Posts Drives: 435d m sport m performance Join Date: Jan 2014 Location: United Kingdom iTrader: (0)	Oil could come from the turbo bearings and such like as they age.
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