1998 Mitsubishi Montero

Engine Mechanical problem
1998 Mitsubishi Montero 6 cyl Two Wheel Drive Automatic 175000 miles

I have a 98 Montero Sport that is leaking oil. I can look under the hood and see that there is oil leaking onto the gaskets (?) And can smell it when I start the car, but it isn't leaking onto the ground. And when I start it up, smoke comes out of the exhaust but not all the time. I have no idea what's wrong and am curious how much it's going to cost me to fix it?
September 25, 2009.

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