Milky substance on my oil cap

Gavkol91 · 02-02-2025, 02:58 PM

Hey guys I just had the oil light come on which is normal because I changed my oil about 5k km ago and when I opened the oil cap there was a milky substance on it. I know what it could possibly be a blown head gasket/ coolant leak or due to short trips in cold weather. Is there any way to diagnose which of the two it could be? Or any insight on the topic in general. Thanks in advance!

Sgop335 · 02-02-2025, 05:05 PM

How is the coolant level?

Leucosticte · 02-02-2025, 06:56 PM

Has it been sitting for a while/only gone on short trips? Mine had this when I was only driving it a mile at a time during covid. As soon as I took it on a long drive it went away.

02-02-2025, 02:58 PM	#1
Gavkol91 Registered 0 Rep 1 Posts Drives: 2008 bmw 335i Join Date: Feb 2025 Location: Canada iTrader: (0)	Milky substance on my oil cap Hey guys I just had the oil light come on which is normal because I changed my oil about 5k km ago and when I opened the oil cap there was a milky substance on it. I know what it could possibly be a blown head gasket/ coolant leak or due to short trips in cold weather. Is there any way to diagnose which of the two it could be? Or any insight on the topic in general. Thanks in advance!
	Appreciate 0 Tweet Quote

02-02-2025, 05:05 PM	#2
Sgop335 Colonel 683 Rep 2,110 Posts Drives: 07 335i e92, 08 535i Join Date: Jun 2014 Location: MD iTrader: (1)	How is the coolant level? __________________ 335i e92 TPC 19Ts
	Appreciate 0 Quote

02-02-2025, 06:56 PM	#3
Leucosticte Lieutenant 404 Rep 498 Posts Drives: 2007 BMW 328xi E92 6mt swap Join Date: Oct 2019 Location: New Jersey iTrader: (0) Garage List 2007 BMW 328xi [0.00]	Has it been sitting for a while/only gone on short trips? Mine had this when I was only driving it a mile at a time during covid. As soon as I took it on a long drive it went away.
	Appreciate 0 Quote