E60 535i oil cooler leaking oil

fusionchicken · 06-18-2018, 04:59 AM

Hello all, 2008 535i here with the N54 engine. I know this forum is for 3 series but it's the most active for N54 engines. If I'm disobeying forum rules please feel free to delete my thread

So after tracking down where my engine is leaking oil (it's leaving nice puddles of oil on the garage floor and my oil level is dropping steadily) I found where one of the oil cooler hoses connects to the oil cooler to be dripping oil, and the fan blows the oil onto the serpentine belt and pulleys, both of which I just replaced last month at a shop. Lovely.

Here's a video of the leak in progress with the engine idling https://streamable.com/s/uxskz/yyyimb

I took out the oil cooler today and inspected where the leak is coming from, but I can't tell why or how there would be an oil leak. I've included 4 angles of where I saw the oil leaked from the oil cooler in the pictures below. The oil cooler hoses are both brand new from BMW and were professionally put in by a shop last month, with new orings

A helpful user suggested maybe I can try high temp JB welding any cracks I see on the oil cooler but I don't see any?*

Where the oil cooler hose connects to the oil cooler, the oring is allegedly brand new from the shop that worked on replacing my oil cooler hoses last month, and the oring looks fine to me? I'll replace the orings for both cooler hoses anyways but I am trying to fix all the leaks before I put everything back together. Perhaps the shop put in the wrong orings for the cooler hoses?

Is there a way to test the oil cooler to see where it's leaking from?*

Socaln54 · 06-18-2018, 01:18 PM

are you in southern california by any chance?

fusionchicken · 06-18-2018, 07:00 PM

Yes sir

feuer · 06-19-2018, 10:19 AM

Quote:

Originally Posted by fusionchicken

The oil cooler hoses are both brand new from BMW and were professionally put in by a shop last month, with new orings

Is the mounting bracket straight? If over tighten it could bent and cause leak.

fusionchicken · 06-19-2018, 06:16 PM

Quote:

Originally Posted by feuer

Is the mounting bracket straight? If over tighten it could bent and cause leak.

Looks straight to me but I’ll remove it tonight when I put in new orings and make sure it’s straight this time

Ramos713 · 12-30-2020, 03:40 PM

Were you able to fix the leak? I’m having the same problem.

06-18-2018, 04:59 AM	#1
fusionchicken Captain 162 Rep 763 Posts Drives: C6 Z06, Z4M Roadster Join Date: Oct 2006 Location: socal iTrader: (0)	E60 535i oil cooler leaking oil Hello all, 2008 535i here with the N54 engine. I know this forum is for 3 series but it's the most active for N54 engines. If I'm disobeying forum rules please feel free to delete my thread So after tracking down where my engine is leaking oil (it's leaving nice puddles of oil on the garage floor and my oil level is dropping steadily) I found where one of the oil cooler hoses connects to the oil cooler to be dripping oil, and the fan blows the oil onto the serpentine belt and pulleys, both of which I just replaced last month at a shop. Lovely. Here's a video of the leak in progress with the engine idling https://streamable.com/s/uxskz/yyyimb I took out the oil cooler today and inspected where the leak is coming from, but I can't tell why or how there would be an oil leak. I've included 4 angles of where I saw the oil leaked from the oil cooler in the pictures below. The oil cooler hoses are both brand new from BMW and were professionally put in by a shop last month, with new orings A helpful user suggested maybe I can try high temp JB welding any cracks I see on the oil cooler but I don't see any?* Where the oil cooler hose connects to the oil cooler, the oring is allegedly brand new from the shop that worked on replacing my oil cooler hoses last month, and the oring looks fine to me? I'll replace the orings for both cooler hoses anyways but I am trying to fix all the leaks before I put everything back together. Perhaps the shop put in the wrong orings for the cooler hoses? Is there a way to test the oil cooler to see where it's leaking from?* Attached Images Last edited by fusionchicken; 06-18-2018 at 05:32 AM..
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06-18-2018, 01:18 PM	#2
Socaln54 Private First Class 35 Rep 125 Posts Drives: 535i Join Date: Jan 2018 Location: CA iTrader: (0)	are you in southern california by any chance?
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06-18-2018, 07:00 PM	#3
fusionchicken Captain 162 Rep 763 Posts Drives: C6 Z06, Z4M Roadster Join Date: Oct 2006 Location: socal iTrader: (0)	Yes sir
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12-30-2020, 03:40 PM	#6
Ramos713 Registered 0 Rep 1 Posts Drives: BMW 335xi Join Date: Dec 2020 Location: Houston iTrader: (0)	Same issue Were you able to fix the leak? I’m having the same problem.
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