Question about 1993 Chevrolet Cavalier

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I have an odd oil leak i my 93 chevy cavalier.

I have an odd oil leak in my 93 chevy cavalier. Basically when i first start it up, the car leaks oil (from what appears to be somewhere under the right side of the engine-if you're standing in front of the car looking under the hood-, but i can't find the source for certain yet). I'm fairly certain it's not the front or rear seals, I've pressure washed everything out and everything around them appears to be staying dry. The car will leak fairly profusely for about 2-3 minutes, and then just stop completely. After that, it won't leak while the car is warm and/or running, doesn't matter if you shut the engine off or not (I've shut it off and turned it back on several times with no result).
The dipstick in my car is also broken, and i discovered that because of this, i've been accidently over servicing it (meaning i've been keeping the oil at a higher level than what it should be). Is it possible that when the car starts it's getting rid of the excess oil, and after the level gets back to normal it will stop? It's still about half a quart over at this point.
Even if this little theory is correct though, the oil has to be coming out from somewhere...but why only when the car first starts??
I'd hugely appreciate any suggestions as to what is causing this. The car is old I realize, but it's all i have and i need to get this figured out. I'd appreciate any help immensely.

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  • mewshari Sep 05, 2009

    The leak comes from underneath the motor for sure, if it was anywhere else I'm fairly certain I would have found it.
    I basically check the oil in the car every couple of days and before I leave for any long trips (It's an old car, and I try to be as vigilant with it as I can). I noticed it looked a little low before driving home to see my parents from New Hampshire (about a 3 hour drive) and I added, probably about half a quart before I left. That was about a week ago, and I haven't added anything since.

  • mewshari Sep 05, 2009

    Doesn't the oil pressure sending unit just measure the pressure and direct the pressure gauge? How would it be involved in an oil leak?

  • mewshari Sep 05, 2009

    The real kick in the head, is that the oil level isn't really decreasing by any major amount. I wonder if when the level reaches normal, it will just stop doing this??? I can't imagine what would make it leak only when the engine first starts up though. It's like clockwork, about 3 minutes or so goes by and the leak just stops and won't resume until I've shut the car off, let it cool down completely, and start it back up again. My pressure gauge remains stable, even when it is leaking.
    I'm just having a really hard time tracing the leak, it's like it's coming from the center somewhere, hard to find either from the top or bottom. I've been going nuts going through my book for the car trying to find possible causes, and I am totally stumped.

  • jason goddard May 11, 2010

    is the leak on top of motor on does it come from underneath? also do you over fill the engine everyday cause if you dont then it not puking out excess



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Check your pcv valve for a clog or carbon build up

Posted on Sep 05, 2009

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Its the oil pressure sending unit!!!

Posted on Sep 05, 2009

  • Dennis Mulford
    Dennis Mulford Sep 05, 2009

    the top[ of the sending unit cracks and leaks under pressure



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