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Thread: Oil pressure warning.

  1. #1
    Join Date
    Apr 2006
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    Long Island, NY
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    Default Oil pressure warning.

    I've been seeing this message frequently and I've been told its nothing to worry about but I thought I'd post to see what you guys think.

    the OBC throws an oil pressure warning generally at idle and with increasing frequency as the car gets hot. I've got a '94 540 converted to manual.

    Is this something I should be concerned about or do I just deal with it?

  2. #2
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    Mar 2006
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    Derbyshire, UK
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    Your oil pump bolts are falling out. See http://www.strictlybmw.com/newslette.../v8oilpump.htm

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

  3. #3
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    Mar 2006
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    I can not imagine ever telling someone to not worry about this. Even if there is nothing wrong with your oil pressure and yu have a bug in the wiring, you will be driving a car that constantly cries wolf and you will ignore a real low oil pressure warning. Its like driving with your brake lights on all the time, you may as well not have a pressure sensor in the car at all.

    If you do have low oil pressure, then you have a real problem that must be fixed if you want to keep driving your car. Most likely it is the oil pump coming loose, or a bad sensor.

  4. #4
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    Ok, so I'm going to have to remove the oil pan to address this. I've seen a number of post about this common issue, but no specific procedures on how. Anyone know of a post of writeup detailing this job?

    Second, since it sounds like its a pretty big job, are there any other preventative maintinence items I should look to perform while I'm going to hoist the engine? Engine mounts looked good over the weekend when I did valve cover gaskets.

  5. #5
    Join Date
    Oct 2004
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    3,395

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    It's not a hard job -- only the lower pan gets removed, not the upper. I do them regularly. Get a new gasket (metal/rubber deal), oil, and OEM filter kit. There are about 25 M6 bolts that hold the pan in place; if the car doesn't have self leveling, you don't need anything more than a 10 mm socket (and maybe a 10 mm wrench for the bolt under the bracket that holds the level sender harness connector).

    best, whit

  6. #6
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    dont forget the red locktite!

    might as well get a new oil level sensor o-ring while you are at it.

  7. #7
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    Oct 2004
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    Loctite is virtually worthless in that environment. Any oil saturation will prevent it from creating a bond, and the substance can float around in the engine, which leads to spun bearings and things like this:




    HHHhhmm...I wonder why that one stopped running...

  8. #8
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    obviously a nikasil failure... brake cleaner spray in the bolt hole with compressed air should make a good fit for loctite.

    Quote Originally Posted by lowell
    Loctite is virtually worthless in that environment. Any oil saturation will prevent it from creating a bond, and the substance can float around in the engine, which leads to spun bearings and things like this:




    HHHhhmm...I wonder why that one stopped running...
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  9. #9
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    Mar 2005
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    Quote Originally Posted by bbig119
    I've been seeing this message frequently and I've been told its nothing to worry about but I thought I'd post to see what you guys think.

    the OBC throws an oil pressure warning generally at idle and with increasing frequency as the car gets hot. I've got a '94 540 converted to manual.

    Is this something I should be concerned about or do I just deal with it?
    I occasionally get an Oil Pressure Sensor warning. Maybe twice since I've owned the car. it turned out to be nothing, but I didn't feel good about it.

    Ralph Mendoza Jr. - Long Beach, CA

  10. #10
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    Apr 2006
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    Quote Originally Posted by lowell
    It's not a hard job -- only the lower pan gets removed, not the upper. I do them regularly. Get a new gasket (metal/rubber deal), oil, and OEM filter kit. There are about 25 M6 bolts that hold the pan in place; if the car doesn't have self leveling, you don't need anything more than a 10 mm socket (and maybe a 10 mm wrench for the bolt under the bracket that holds the level sender harness connector).

    best, whit
    What if it has self leveling?

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