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      07-29-2013, 08:13 PM   #1
Ninjaoz
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Intercooler oil leak E90 LCI

Hi everyone

I have a small oil leak on my 2011 320d LCI, the oil leak coming from the hose connecting to the intercooler. There are noticable oil stain on the bottom of the engine compartment tray. It looks like the leaks occurs when the oil heats up and pressure builds up.

Has anyone experienced similar problem? Could it be simply the clamps on the hoses are loose or a faulty CCV/PCV? The car still drives beautifully and don't notice any loss in performance though.

I've already taken to BMW dealer for a repair as my car is still under warranty, currently waiting for them to get it fixed

Any ideas guys?

Cheers
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      08-16-2013, 02:49 PM   #2
HFELIU
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Wow, I'm currently doing a radiator replacement on my E90 and as I was removing the intercooler i noticed a little oil build up and slight leak coming from the passenger side of the intercooler hose. Did you ever find out what was causing your issue?
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      08-18-2013, 10:28 PM   #3
Ninjaoz
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The dealer diagnosed that it was a faulty hose connector and replaced it under warranty. The SA advised me that it is normal to have a slight oil build up to the intercooler for turbo BMWs as I was worried that it could be a faulty oil separator / CCV that caused the oil leak.
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      08-20-2013, 09:12 AM   #4
Jin-ActiveMotorwerke
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It's true that all turbo BMWs will have small amount of oil in the intake system.
But a faulty PCV will also cause excessive oil build up in it. That's why PCV is a service item in some of the diesel engines.
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