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Thread: Common Oil Leak Sources

  1. #1
    Join Date
    May 2004
    Posts
    251

    Default Common Oil Leak Sources

    Didn't find anything on this with a search. Saw a couple things about replacing the oil pan gasket. Also remember reading about the low oil level sensor possibly being a leak source.
    The wife's 525 is leaking oil and a general inspection doesn't seem to pinpoint a source. What are the usual sources? How have you located the source? I've not used the UV dye thing and I (surprise)don't have a black light on hand...
    Link to my M50 engine rebuild thread
    http://www.bimmernut.com/forum/showthread.php/43339-M50-Eng-4L30E-Trans-RRR-Far-More-Than-I-Ever-Expected?highlight=93+525+paul


  2. #2
    Join Date
    Mar 2006
    Location
    Derbyshire, UK
    Posts
    871

    Default

    The valve cover gaskets are a good candidate.

    1997 535i V8
    5spd, OBC, A/C, cruise, BMW phone, factory M-Tech wheel & suspension, 18" Alpinas

  3. #3
    Join Date
    May 2004
    Posts
    251

    Default Crankshaft seals

    Does anyone else have bad (and worsening) oil leaks? Seems like the front and rear crank seals are leaking and it's getting pretty bad. Anyone solve the problem?
    Link to my M50 engine rebuild thread
    http://www.bimmernut.com/forum/showthread.php/43339-M50-Eng-4L30E-Trans-RRR-Far-More-Than-I-Ever-Expected?highlight=93+525+paul


  4. #4
    Join Date
    Mar 2004
    Posts
    454

    Default

    Mine was a head gasket...

    Scott
    1995 BMW 525i w/139K miles, EAT Chip - (Gone)
    07 525i 22K, 07 328xi (41K)
    1982 Mazda RX-7 w/147K miles (Back again!)

  5. #5
    Join Date
    Mar 2004
    Location
    So Cal
    Posts
    290

    Default

    The oil filter housing is a likely suspect. I did a search and found some good tips on how to DIY. I figured I would do this while I had my cylinder head out.
    Attached Images Attached Images  

    Greg Mendoza

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