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  1. #1
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    Member No: 111509 dergelbebmw is an unknown quantity at this point dergelbebmw's Avatar
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    Yellow sludge around the oil cap

    I'm having some problems with my manual BMW 330Xi '01. Underneath the oil cap, I have found this yellow sludge, that I believe is a mix of water and oil and this has persisted for the last couple months. There has been no white, sweet smelling smoke coming out the tailpipe, even though the coolant level did drop half a cup in the past 3 months, so I don't think it's a head gasket failure, but I'm not for sure. Also, I typically drive long distances, so I don't think the excess water could be from just driving it short distances in the cold weather without first properly heating it up. I don't know how the excess water from combustion in the crank case usually exits the engine, so another idea was the PCV Valve. Any ideas as to what could be wrong?

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    no pcv...oil separator instead.

    could be time for an engine crankcase vent system overhaul. See previous posts on this page

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  3. #3
    Dan C
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    Re: no pcv...oil seperator instead.

    I have an '01 330xi as well. I saw this yellow stuff too when I changed my oil last weekend. I've noticed it several times myself. I've been doing my own oil changes for the 3 years I've owned the car. Typically, I see this in the Winter months and not in the Summer. I've always attributed it to the engine not adequately warming up in my short commute to the office in cold weather. I also do far less driving in the Winter too, and I thought that played a part too.

  4. #4
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    I expect that you are correct...and this could be

    leading up to the same problem that has been(recently) discussed in detail.

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    Re: I expect that you are correct...and this could be

    Thanks guys. I'll look up the other thread HBWT.

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    Those driving conditions contribute.

    I think the only reason my CCV lasted so long (135k miles) was that 95% of the time, the car gets up to temp and I don't make a lot of short trips with a freshly started car.

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