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Thread: Oil Pan or Filter Housing Gasket?

  1. #1
    Join Date
    Aug 2017
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    Memphis
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    Z3

    Oil Pan or Filter Housing Gasket?

    Really don't wanna have to replace the oil pas gasket if I don't have too. But it sure looks like the oil pan is leaking. If the oil filter housing gasket is leaking, can it drip down and appear to look like the pan gasket is leaking? Anyone experienced this before, or have some insight?

  2. #2
    Join Date
    Nov 2009
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    Herndon, VA
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    '99 z3 2.8L, '10 VW GTI
    Quote Originally Posted by Roscoe458 View Post
    Really don't wanna have to replace the oil pas gasket if I don't have too. But it sure looks like the oil pan is leaking. If the oil filter housing gasket is leaking, can it drip down and appear to look like the pan gasket is leaking? Anyone experienced this before, or have some insight?
    If the oil filter housing gasket is leaking it can definitely make it seem as if the pan is leaking. I had this happen. Try to clean it as best as you can or take it to a reputable shop for diagnosis and then decide for yourself. I ended up changing the oil filter housing myself and it solved 95% of my problem.
    Last edited by sijray21; 04-21-2019 at 06:20 AM.

  3. #3
    Join Date
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    Put the car up in the air in a well ventilated area. Place several large overlapping sheets of cardboard under the car all around. Do no do this over a surface that you care about staining like a new concrete pad. Using brake parts cleaner, thoroughly spray down the pan, block, transmission, cross brace, mounts, steering rack, etc. (wear safety goggles and dish washing gloves). Clean it until it's spic and span. Spray from the top judiciously at those areas of the block you can see--avoid hoses, connectors, etc. From underneath (close the hood to prevent over spray onto painted surfaces) really soak it down. The whole process should take several cans. Wipe down what you can with shop rags and allow it to dry completely--an hour or more depending on the weather. The entire underside should be clean. After driving it, inspect--oil won't travel upwards, so it is leaking where the wet begins--trace the wet to the source. Fix the leak. Clean it again local to the leak, and it should stay clean thereafter.

  4. #4
    Join Date
    Nov 2016
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    '02 540i-6, '97 540i-6
    +1 to ^. The only addition I have is to spray WD-40 or similar on any sections that are heavily gunked up, or thick with oil and dirt. Let the WD-40 soak in for a few minutes to loosen things up. Then I start with the brake cleaner.

  5. #5
    Join Date
    May 2002
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    99-01 M Cpe & Rdts, X5M
    Not knowing the specific engine you have in your car, I will add to the above points that the S54 engine has an oil pressure regulating valve about mid-height at the extreme rear RH side of the engine block. While the valve itself never seems to present a problem, the O-ring that seals between it and the block has been know to leak on several examples.

    Historically, I replace the whole valve/O-ring assembly. This can be done in situ.





    PRV seen at extreme LH end of block, just below the outline of the cylinder barrel.



    ALL S54 owners should keep this in mind; I don't know if the M54 engine is similarly equipped...

  6. #6
    Join Date
    Dec 2007
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    E36/7 E36/8x2 E39/2 E46
    >I don't know if the M54 engine is similarly equipped...

    No. Contrary to the extremely popular belief that all Z3s are the same, only the S54 has the high pressure VANOS with it's own pump and regulating system. If an M54 has a wet oil pan, replace the oil filter housing gasket. Because, you know, gravity and such.


    /.randy

  7. #7
    Join Date
    Aug 2017
    Location
    Memphis
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    Z3
    Thanks for the info! I got her clean like suggested. Gonna drive her awhile and see if I can get figured out. When I come to a conclusion I will let yall know.
    Last edited by Roscoe458; 04-22-2019 at 12:21 AM.

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