[fusionchicken]

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]

are you in southern california by any chance?

[fusionchicken]

Yes sir

[feuer]

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]

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]

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