leaking oil bad. once i start car oil pours out from some plug that looks like

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plug that looks like a release valve when you drain a radiator but bigger and yellow in color and it's looks like it is mounted at the edge of oil pan or some kind of pan once i start the car oil pours out of it. looks like it might have a spring and rubber point on it. can someone help me figure out what it is or where leak might be coming from?